diff --git a/bot.py b/bot.py
index e6e0139..8d5686f 100644
--- a/bot.py
+++ b/bot.py
@@ -1,19 +1,319 @@
 #! /usr/bin/env python3
 
 # modules
+import os
 import sys
 import time
 import json
+from random import choice
 from pprint import pprint
 import telepot
 from telepot.loop import MessageLoop
+from telepot.namedtuple import ReplyKeyboardMarkup, ReplyKeyboardRemove
 # config
-from config import NAME, TOKEN
-from interface import Kuser
+from config import NAME, URL, TOKEN
+from kcoj import KCOJ
+import promote
+import external
 
 bot = telepot.Bot(TOKEN)
 users = {}
 
+class Kuser:
+    def __init__(self, userid, username='', password='', status='第一次用', question='題外'):
+        self._userid = userid
+        self._username = username
+        self._password = password
+        self._status = status
+        self._question = question
+        self._api = KCOJ(URL)
+
+    def new_user(self):
+        self.help()
+        self.press_username()
+    
+    def press_username(self):
+        self._status = '輸入學號'
+        self._question = '題外'
+        bot.sendMessage(self._userid, "請輸入您的學號：", reply_markup=ReplyKeyboardRemove())
+
+    def press_password(self, text):
+        self._status = '輸入密碼'
+        self._question = '題外'
+        self._username = text
+        bot.sendMessage(self._userid, "輸入完可刪除訊息以策安全！\n"
+                                     "請輸入您的密碼：", reply_markup=ReplyKeyboardRemove())
+
+    def press_oldpassword(self):
+        self._status = '舊的密碼'
+        self._question = '題外'
+        bot.sendMessage(self._userid, "請輸入要原本的舊密碼：",
+            reply_markup=ReplyKeyboardMarkup(keyboard=[
+                ["首頁🏠"]
+            ], resize_keyboard=True))
+
+    def press_newpassword(self, text):
+        if text != self._password:
+            self._status = '正常使用'
+            self._question = '題外'
+            bot.sendMessage(self._userid, "密碼錯誤！",
+                reply_markup=ReplyKeyboardMarkup(keyboard=[
+                    ["首頁🏠"]
+                ], resize_keyboard=True))
+        else:
+            self._status = '修改密碼'
+            self._question = '題外'
+            bot.sendMessage(self._userid, "使用此功能請務必小心！\n"
+                                         "請輸入要設定的新密碼：",
+                reply_markup=ReplyKeyboardMarkup(keyboard=[
+                    ["首頁🏠"]
+                ], resize_keyboard=True))
+        
+    def change_password(self, text):
+        self._status = '正常使用'
+        self._question = '題外'
+        self._password = text
+        bot.sendMessage(self._userid, "修改成功！" if self._api.change_password(self._password) == True else "修改失敗。",
+            reply_markup=ReplyKeyboardMarkup(keyboard=[
+                ["首頁🏠"]
+            ], resize_keyboard=True))
+
+    def login(self, text):
+        self._status = '正常使用'
+        self._question = '題外'
+        self._password = text
+        bot.sendMessage(self._userid, "登入中...", reply_markup=ReplyKeyboardRemove())
+        if self.check_online(self._userid) == True:
+            self.show_homepage(self._userid)
+
+    def login_failed(self, chat_id, message_id):
+        self._status = '正常使用'
+        self._question = '題外'
+        if chat_id != self._userid:
+            bot.sendMessage(chat_id, "登入失敗，請先私訊我重新登入 KCOJ", reply_to_message_id=message_id)
+        bot.sendMessage(self._userid, "哇...登入失敗，讓我們重新開始", reply_markup=ReplyKeyboardRemove())
+        self.press_username()
+        
+    def connect_failed(self, chat_id, message_id):
+        self._status = '正常使用'
+        self._question = '題外'
+        if chat_id != self._userid:
+            bot.sendMessage(chat_id, "KCOJ 離線中！請稍後再試", reply_to_message_id=message_id)
+        else:
+            bot.sendMessage(self._userid, "KCOJ 離線中！請稍後再試",
+                reply_markup=ReplyKeyboardMarkup(keyboard=[
+                    ["首頁🏠", "幫助📚"]
+                ], resize_keyboard=True))
+
+    def check_online(self, chat_id, message_id=''):
+        result = self._api.check_online()
+        if result == None:
+            self.connect_failed(chat_id, message_id)
+            return False
+        else:
+            if result == False:
+                self._api.login(self._username, self._password, 2)
+                result = self._api.check_online()
+            if result == False:
+                self.login_failed(chat_id, message_id)
+            elif result == None:
+                self.connect_failed(chat_id, message_id)
+            return result == True
+
+    def logout(self):
+        self._status = '正常使用'
+        self._question = '題外'
+        bot.sendMessage(self._userid, "您現在已經是登出的狀態。", reply_markup=ReplyKeyboardRemove())
+        self.press_username()
+
+    def show_homepage(self, chat_id):
+        self._status = '正常使用'
+        self._question = '題外'
+        q_dict = self._api.list_questions()
+        q_str = ''
+        for key in q_dict.keys():
+            if q_dict[key][1] == '期限未到':
+                q_str += "📗<b>" + key + "</b> (DL: " + q_dict[key][0] + ")\n [[" + q_dict[key][3] + "]] [[" + q_dict[key][2] + "]]"
+                q_str += "⚠️" if q_dict[key][2] == '未繳' else "✅"
+                q_str += "  /question_" + key + "\n\n"
+        bot.sendMessage(chat_id, "💁 <b>" + self._username + "</b> " + NAME + "\n"
+                                 "➖➖➖➖➖\n"
+                                 "📝<i>可繳交的作業</i>\n\n" + q_str + \
+                                 "➖➖➖➖➖\n" + choice(promote.sentences),
+                                 parse_mode='HTML',
+                                 reply_markup=ReplyKeyboardMarkup(keyboard=[
+                                     ["題庫📝"],
+                                     ["登出🚪", "改密碼💱", "幫助📚"]
+                                 ], resize_keyboard=True) if chat_id == self._userid else ReplyKeyboardRemove(),
+                                 disable_web_page_preview=False)
+
+    def list_questions(self, chat_id):
+        self._status = '正常使用'
+        self._question = '題外'
+        q_dict = self._api.list_questions()
+        q_str = ''
+        for key in q_dict.keys():
+            q_str += "📗" if q_dict[key][1] == '期限未到' else "📕"
+            q_str += "<b>" + key + "</b> (DL: " + q_dict[key][0] + ")\n [[" + q_dict[key][3] + "]] [[" + q_dict[key][2] + "]]"
+            q_str += "⚠️" if q_dict[key][2] == '未繳' else "✅"
+            q_str += "  /question_" + key + "\n\n"
+        reply = bot.sendMessage(chat_id, "💁 <b>" + self._username + "</b> " + NAME + "\n"
+                                         "➖➖➖➖➖\n"
+                                         "📝<i>所有作業</i>\n\n" + q_str + \
+                                         "➖➖➖➖➖\n" + choice(promote.sentences),
+                                         parse_mode='HTML',
+                                         reply_markup=ReplyKeyboardMarkup(keyboard=[
+                                             ["首頁🏠", "更新🔃"],
+                                             ["登出🚪", "改密碼💱", "幫助📚"]
+                                         ], resize_keyboard=True) if chat_id == self._userid else ReplyKeyboardRemove(),
+                                         disable_web_page_preview=False)
+        bot.sendMessage(chat_id, "點我到題庫頂", reply_to_message_id=reply['message_id'])
+
+    def show_question(self, number, chat_id):
+        self._status = '查看題目'
+        self._question = number
+        if number in external.QUESTION:
+            ext_q = True
+            content = external.QUESTION[number]
+        else:
+            ext_q = False
+            content = '```\n' + self._api.show_question(number) + '\n```'
+        q = self._api.list_questions()[number]
+        q_str = "💁 *" + self._username + "* [" + NAME + "]\n"
+        q_str += "➖➖➖➖➖\n"
+        q_str += "📗" if q[1] == '期限未到' else "📕"
+        q_str += "*" + number + "* (DL: " + q[0] + ")\n [[[" + q[3] + "]]] [[[" + q[2] + "]]]"
+        q_str += "⚠️" if q[2] == '未繳' else "✅"
+        reply = bot.sendMessage(chat_id, q_str + "\n\n" + content,
+            parse_mode='Markdown',
+            reply_markup=ReplyKeyboardMarkup(keyboard=[
+                ["首頁🏠", "題庫📝"],
+                ["交作業📮" if q[1] == '期限未到' else '', "看結果☑️" if q[2] == '已繳' else '', "通過者🌐"],
+                ["登出🚪", "改密碼💱", "幫助📚"]
+            ], resize_keyboard=True) if chat_id == self._userid else ReplyKeyboardRemove())
+        if ext_q == False:
+            bot.sendMessage(chat_id, "點我到題目頂", reply_to_message_id=reply['message_id'])
+
+    def help(self):
+        bot.sendMessage(self._userid, "這裡是 Kuo C Online Judge Bot！\n"
+                                     "可以簡稱 KCOJ Bot，目前定居於 [" + NAME + "]\n"
+                                     "作用是讓大家可以方便的透過我使用郭老程設課的 Online Judge\n"
+                                     "➡️[OJ 傳送門](" + URL + ")\n"
+                                     "操作很簡單（？）\n\n"
+                                     "還是稍微提幾個需要注意的地方：\n"
+                                     "1. 📗代表還可以繳交的作業，📕代表已經不能繳交的作業\n"
+                                     "2. ⚠️代表還沒有繳交的作業，✅代表已經繳交的作業\n"
+                                     "3. 其實在查看題目的畫面就可以用「拖曳」的方式 *上傳作業📮*\n"
+                                     "4. *刪除作業⚔️* 的功能被放在 *上傳作業📮* 裡面\n"
+                                     "5. 學號與密碼將以「明文」方式儲存\n"
+                                     "6. 郭老的 Online Judge 其實也是以「明文」方式儲存您的帳號密碼\n"
+                                     "7. 我以我的人格擔保，不會使用您提供的資訊侵害您的權利\n\n"
+                                     "本專案採用 *MIT License*\n"
+                                     "聯絡我請私訊 @PinLin\n"
+                                     "原始碼被託管於 GitHub，如果想要鼓勵我的話可以幫我按個星星> </\n"
+                                     "網址如下：\n"
+                                     "[https://github.com/PinLin/KCOJ_bot]\n\n",
+                                     parse_mode='Markdown')
+
+    def upload_answer(self):
+        self._status = '上傳答案'
+        q = self._api.list_questions()[self._question]
+        q_str = "💁 <b>" + self._username + "</b> " + NAME + "\n"
+        q_str += "➖➖➖➖➖\n"
+        q_str += "📗" if q[1] == '期限未到' else "📕"
+        q_str += "<b>" + self._question + "</b> (DL: " + q[0] + ")\n [[" + q[3] + "]] [[" + q[2] + "]]"
+        q_str += "⚠️" if q[2] == '未繳' else "✅"
+        bot.sendMessage(self._userid, q_str + "\n\n現在請把你的程式碼讓我看看（請別超過 20 MB）\n"
+                                             "可以使用「文字訊息」或是「傳送檔案」的方式\n"
+                                             "（注意：可在程式碼前後加上單獨成行的 ``` 避免可能的錯誤。）", parse_mode='HTML',
+                                             reply_markup=ReplyKeyboardMarkup(keyboard=[
+                                                 ["刪除作業⚔️"] if self._api.list_questions()[self._question][2] == '已繳' else [],
+                                                 ["首頁🏠", "回題目📜"]
+                                             ], resize_keyboard=True))
+
+    def send_answer(self, text, file_id):
+        self._status = '正常使用'
+        # define filename
+        filename = sys.path[0] + '/' + self._username + self._question
+        if self._api.list_questions()[self._question][3] == 'Python':
+            filename += '.py'
+        else:
+            filename += '.c'
+
+        if text != '':
+            with open(filename, 'w') as f:
+                f.write(text)
+        else:
+            bot.download_file(file_id, filename)
+        self._api.delete_answer(self._question)
+        if self._api.upload_answer(self._question, filename) == True:
+            bot.sendMessage(self._userid, "上傳成功",
+                reply_markup=ReplyKeyboardMarkup(keyboard=[
+                    ["首頁🏠", "回題目📜"],
+                    ["看結果☑️"],
+                    ["登出🚪", "改密碼💱", "幫助📚"]
+                ], resize_keyboard=True))
+        else:
+            bot.sendMessage(self._userid, "上傳失敗",
+                reply_markup=ReplyKeyboardMarkup(keyboard=[
+                    ["首頁🏠", "回題目📜"],
+                    ["登出🚪", "改密碼💱", "幫助📚"]
+                ], resize_keyboard=True))
+        os.remove(filename)    
+    
+    def delete_answer(self):
+        bot.sendMessage(self._userid, "移除成功" if self._api.delete_answer(self._question) == True else "移除失敗",
+            reply_markup=ReplyKeyboardMarkup(keyboard=[
+                ["首頁🏠", "回題目📜"],
+                ["登出🚪", "改密碼💱", "幫助📚"]
+            ], resize_keyboard=True))
+
+    def send_failed(self):
+        self._status = '正常使用'
+        bot.sendMessage(self._userid, "檔案不能超過 20 MB！上傳失敗",
+            reply_markup=ReplyKeyboardMarkup(keyboard=[
+                ["首頁🏠", "回題目📜"],
+                ["登出🚪", "改密碼💱", "幫助📚"]
+            ], resize_keyboard=True))
+
+    def list_passers(self):
+        self._status = '正常使用'
+        q = self._api.list_questions()[self._question]
+        q_str = "💁 <b>" + self._username + "</b> " + NAME + "\n"
+        q_str += "➖➖➖➖➖\n"
+        q_str += "📗" if q[1] == '期限未到' else "📕"
+        q_str += "<b>" + self._question + "</b> (DL: " + q[0] + ")\n [[" + q[3] + "]] [[" + q[2] + "]]"
+        q_str += "⚠️" if q[2] == '未繳' else "✅"
+        q_str += "<code>\n"
+        for passer in self._api.list_passers(self._question):
+            q_str += "\n" + passer
+        reply = bot.sendMessage(self._userid, q_str + "</code>", 
+            parse_mode='HTML',
+            reply_markup=ReplyKeyboardMarkup(keyboard=[
+                ["首頁🏠", "回題目📜"],
+                ["登出🚪", "改密碼💱", "幫助📚"]
+            ], resize_keyboard=True))
+        bot.sendMessage(self._userid, "點我到名單頂", reply_to_message_id=reply['message_id'])
+
+    def list_results(self):
+        self._status = '正常使用'
+        q = self._api.list_questions()[self._question]
+        q_str = "💁 <b>" + self._username + "</b> " + NAME + "\n"
+        q_str += "➖➖➖➖➖\n"
+        q_str += "📗" if q[1] == '期限未到' else "📕"
+        q_str += "<b>" + self._question + "</b> (DL: " + q[0] + ")\n"
+        for result in self._api.list_results(self._question, self._username):
+            q_str += "\n測試編號 <code>" + result[0] + "</code>："
+            q_str += "✔️ " if result[1] == '通過測試' else "❌ "
+            q_str += result[1]
+        bot.sendMessage(self._userid, q_str, 
+            parse_mode='HTML', 
+            reply_markup=ReplyKeyboardMarkup(keyboard=[
+                ["首頁🏠", "回題目📜"],
+                ["交作業📮" if q[1] == '期限未到' else '', "通過者🌐"],
+                ["登出🚪", "改密碼💱", "幫助📚"]
+            ], resize_keyboard=True))
+
 def on_chat(msg):
     content_type, chat_type, chat_id = telepot.glance(msg)
     from_id = msg['from']['id']
diff --git a/interface.py b/interface.py
deleted file mode 100644
index dc91235..0000000
--- a/interface.py
+++ /dev/null
@@ -1,310 +0,0 @@
-#! /usr/bin/env python3
-
-# modules
-import os
-import sys
-from random import choice
-import telepot
-from telepot.namedtuple import ReplyKeyboardMarkup, ReplyKeyboardRemove
-# config
-from config import NAME, URL, TOKEN
-from kcoj import KCOJ
-import promote
-import external
-
-bot = telepot.Bot(TOKEN)
-
-class Kuser:
-    def __init__(self, userid, username='', password='', status='第一次用', question='題外'):
-        self._userid = userid
-        self._username = username
-        self._password = password
-        self._status = status
-        self._question = question
-        self._api = KCOJ(URL)
-
-    def new_user(self):
-        self.help()
-        self.press_username()
-    
-    def press_username(self):
-        self._status = '輸入學號'
-        self._question = '題外'
-        bot.sendMessage(self._userid, "請輸入您的學號：", reply_markup=ReplyKeyboardRemove())
-
-    def press_password(self, text):
-        self._status = '輸入密碼'
-        self._question = '題外'
-        self._username = text
-        bot.sendMessage(self._userid, "輸入完可刪除訊息以策安全！\n"
-                                     "請輸入您的密碼：", reply_markup=ReplyKeyboardRemove())
-
-    def press_oldpassword(self):
-        self._status = '舊的密碼'
-        self._question = '題外'
-        bot.sendMessage(self._userid, "請輸入要原本的舊密碼：",
-            reply_markup=ReplyKeyboardMarkup(keyboard=[
-                ["首頁🏠"]
-            ], resize_keyboard=True))
-
-    def press_newpassword(self, text):
-        if text != self._password:
-            self._status = '正常使用'
-            self._question = '題外'
-            bot.sendMessage(self._userid, "密碼錯誤！",
-                reply_markup=ReplyKeyboardMarkup(keyboard=[
-                    ["首頁🏠"]
-                ], resize_keyboard=True))
-        else:
-            self._status = '修改密碼'
-            self._question = '題外'
-            bot.sendMessage(self._userid, "使用此功能請務必小心！\n"
-                                         "請輸入要設定的新密碼：",
-                reply_markup=ReplyKeyboardMarkup(keyboard=[
-                    ["首頁🏠"]
-                ], resize_keyboard=True))
-        
-    def change_password(self, text):
-        self._status = '正常使用'
-        self._question = '題外'
-        self._password = text
-        bot.sendMessage(self._userid, "修改成功！" if self._api.change_password(self._password) == True else "修改失敗。",
-            reply_markup=ReplyKeyboardMarkup(keyboard=[
-                ["首頁🏠"]
-            ], resize_keyboard=True))
-
-    def login(self, text):
-        self._status = '正常使用'
-        self._question = '題外'
-        self._password = text
-        bot.sendMessage(self._userid, "登入中...", reply_markup=ReplyKeyboardRemove())
-        if self.check_online(self._userid) == True:
-            self.show_homepage(self._userid)
-
-    def login_failed(self, chat_id, message_id):
-        self._status = '正常使用'
-        self._question = '題外'
-        if chat_id != self._userid:
-            bot.sendMessage(chat_id, "登入失敗，請先私訊我重新登入 KCOJ", reply_to_message_id=message_id)
-        bot.sendMessage(self._userid, "哇...登入失敗，讓我們重新開始", reply_markup=ReplyKeyboardRemove())
-        self.press_username()
-        
-    def connect_failed(self, chat_id, message_id):
-        self._status = '正常使用'
-        self._question = '題外'
-        if chat_id != self._userid:
-            bot.sendMessage(chat_id, "KCOJ 離線中！請稍後再試", reply_to_message_id=message_id)
-        else:
-            bot.sendMessage(self._userid, "KCOJ 離線中！請稍後再試",
-                reply_markup=ReplyKeyboardMarkup(keyboard=[
-                    ["首頁🏠", "幫助📚"]
-                ], resize_keyboard=True))
-
-    def check_online(self, chat_id, message_id=''):
-        result = self._api.check_online()
-        if result == None:
-            self.connect_failed(chat_id, message_id)
-            return False
-        else:
-            if result == False:
-                self._api.login(self._username, self._password, 2)
-                result = self._api.check_online()
-            if result == False:
-                self.login_failed(chat_id, message_id)
-            elif result == None:
-                self.connect_failed(chat_id, message_id)
-            return result == True
-
-    def logout(self):
-        self._status = '正常使用'
-        self._question = '題外'
-        bot.sendMessage(self._userid, "您現在已經是登出的狀態。", reply_markup=ReplyKeyboardRemove())
-        self.press_username()
-
-    def show_homepage(self, chat_id):
-        self._status = '正常使用'
-        self._question = '題外'
-        q_dict = self._api.list_questions()
-        q_str = ''
-        for key in q_dict.keys():
-            if q_dict[key][1] == '期限未到':
-                q_str += "📗<b>" + key + "</b> (DL: " + q_dict[key][0] + ")\n [[" + q_dict[key][3] + "]] [[" + q_dict[key][2] + "]]"
-                q_str += "⚠️" if q_dict[key][2] == '未繳' else "✅"
-                q_str += "  /question_" + key + "\n\n"
-        bot.sendMessage(chat_id, "💁 <b>" + self._username + "</b> " + NAME + "\n"
-                                 "➖➖➖➖➖\n"
-                                 "📝<i>可繳交的作業</i>\n\n" + q_str + \
-                                 "➖➖➖➖➖\n" + choice(promote.sentences),
-                                 parse_mode='HTML',
-                                 reply_markup=ReplyKeyboardMarkup(keyboard=[
-                                     ["題庫📝"],
-                                     ["登出🚪", "改密碼💱", "幫助📚"]
-                                 ], resize_keyboard=True) if chat_id == self._userid else ReplyKeyboardRemove(),
-                                 disable_web_page_preview=False)
-
-    def list_questions(self, chat_id):
-        self._status = '正常使用'
-        self._question = '題外'
-        q_dict = self._api.list_questions()
-        q_str = ''
-        for key in q_dict.keys():
-            q_str += "📗" if q_dict[key][1] == '期限未到' else "📕"
-            q_str += "<b>" + key + "</b> (DL: " + q_dict[key][0] + ")\n [[" + q_dict[key][3] + "]] [[" + q_dict[key][2] + "]]"
-            q_str += "⚠️" if q_dict[key][2] == '未繳' else "✅"
-            q_str += "  /question_" + key + "\n\n"
-        reply = bot.sendMessage(chat_id, "💁 <b>" + self._username + "</b> " + NAME + "\n"
-                                         "➖➖➖➖➖\n"
-                                         "📝<i>所有作業</i>\n\n" + q_str + \
-                                         "➖➖➖➖➖\n" + choice(promote.sentences),
-                                         parse_mode='HTML',
-                                         reply_markup=ReplyKeyboardMarkup(keyboard=[
-                                             ["首頁🏠", "更新🔃"],
-                                             ["登出🚪", "改密碼💱", "幫助📚"]
-                                         ], resize_keyboard=True) if chat_id == self._userid else ReplyKeyboardRemove(),
-                                         disable_web_page_preview=False)
-        bot.sendMessage(chat_id, "點我到題庫頂", reply_to_message_id=reply['message_id'])
-
-    def show_question(self, number, chat_id):
-        self._status = '查看題目'
-        self._question = number
-        if number in external.QUESTION:
-            ext_q = True
-            content = external.QUESTION[number]
-        else:
-            ext_q = False
-            content = '```\n' + self._api.show_question(number) + '\n```'
-        q = self._api.list_questions()[number]
-        q_str = "💁 *" + self._username + "* [" + NAME + "]\n"
-        q_str += "➖➖➖➖➖\n"
-        q_str += "📗" if q[1] == '期限未到' else "📕"
-        q_str += "*" + number + "* (DL: " + q[0] + ")\n [[[" + q[3] + "]]] [[[" + q[2] + "]]]"
-        q_str += "⚠️" if q[2] == '未繳' else "✅"
-        reply = bot.sendMessage(chat_id, q_str + "\n\n" + content,
-            parse_mode='Markdown',
-            reply_markup=ReplyKeyboardMarkup(keyboard=[
-                ["首頁🏠", "題庫📝"],
-                ["交作業📮" if q[1] == '期限未到' else '', "看結果☑️" if q[2] == '已繳' else '', "通過者🌐"],
-                ["登出🚪", "改密碼💱", "幫助📚"]
-            ], resize_keyboard=True) if chat_id == self._userid else ReplyKeyboardRemove())
-        if ext_q == False:
-            bot.sendMessage(chat_id, "點我到題目頂", reply_to_message_id=reply['message_id'])
-
-    def help(self):
-        bot.sendMessage(self._userid, "這裡是 Kuo C Online Judge Bot！\n"
-                                     "可以簡稱 KCOJ Bot，目前定居於 [" + NAME + "]\n"
-                                     "作用是讓大家可以方便的透過我使用郭老程設課的 Online Judge\n"
-                                     "➡️[OJ 傳送門](" + URL + ")\n"
-                                     "操作很簡單（？）\n\n"
-                                     "還是稍微提幾個需要注意的地方：\n"
-                                     "1. 📗代表還可以繳交的作業，📕代表已經不能繳交的作業\n"
-                                     "2. ⚠️代表還沒有繳交的作業，✅代表已經繳交的作業\n"
-                                     "3. 其實在查看題目的畫面就可以用「拖曳」的方式 *上傳作業📮*\n"
-                                     "4. *刪除作業⚔️* 的功能被放在 *上傳作業📮* 裡面\n"
-                                     "5. 學號與密碼將以「明文」方式儲存\n"
-                                     "6. 郭老的 Online Judge 其實也是以「明文」方式儲存您的帳號密碼\n"
-                                     "7. 我以我的人格擔保，不會使用您提供的資訊侵害您的權利\n\n"
-                                     "本專案採用 *MIT License*\n"
-                                     "聯絡我請私訊 @PinLin\n"
-                                     "原始碼被託管於 GitHub，如果想要鼓勵我的話可以幫我按個星星> </\n"
-                                     "網址如下：\n"
-                                     "[https://github.com/PinLin/KCOJ_bot]\n\n",
-                                     parse_mode='Markdown')
-
-    def upload_answer(self):
-        self._status = '上傳答案'
-        q = self._api.list_questions()[self._question]
-        q_str = "💁 <b>" + self._username + "</b> " + NAME + "\n"
-        q_str += "➖➖➖➖➖\n"
-        q_str += "📗" if q[1] == '期限未到' else "📕"
-        q_str += "<b>" + self._question + "</b> (DL: " + q[0] + ")\n [[" + q[3] + "]] [[" + q[2] + "]]"
-        q_str += "⚠️" if q[2] == '未繳' else "✅"
-        bot.sendMessage(self._userid, q_str + "\n\n現在請把你的程式碼讓我看看（請別超過 20 MB）\n"
-                                             "可以使用「文字訊息」或是「傳送檔案」的方式\n"
-                                             "（注意：可在程式碼前後加上單獨成行的 ``` 避免可能的錯誤。）", parse_mode='HTML',
-                                             reply_markup=ReplyKeyboardMarkup(keyboard=[
-                                                 ["刪除作業⚔️"] if self._api.list_questions()[self._question][2] == '已繳' else [],
-                                                 ["首頁🏠", "回題目📜"]
-                                             ], resize_keyboard=True))
-
-    def send_answer(self, text, file_id):
-        self._status = '正常使用'
-        # define filename
-        filename = sys.path[0] + '/' + self._username + self._question
-        if self._api.list_questions()[self._question][3] == 'Python':
-            filename += '.py'
-        else:
-            filename += '.c'
-
-        if text != '':
-            with open(filename, 'w') as f:
-                f.write(text)
-        else:
-            bot.download_file(file_id, filename)
-        self._api.delete_answer(self._question)
-        if self._api.upload_answer(self._question, filename) == True:
-            bot.sendMessage(self._userid, "上傳成功",
-                reply_markup=ReplyKeyboardMarkup(keyboard=[
-                    ["首頁🏠", "回題目📜"],
-                    ["看結果☑️"],
-                    ["登出🚪", "改密碼💱", "幫助📚"]
-                ], resize_keyboard=True))
-        else:
-            bot.sendMessage(self._userid, "上傳失敗",
-                reply_markup=ReplyKeyboardMarkup(keyboard=[
-                    ["首頁🏠", "回題目📜"],
-                    ["登出🚪", "改密碼💱", "幫助📚"]
-                ], resize_keyboard=True))
-        os.remove(filename)    
-    
-    def delete_answer(self):
-        bot.sendMessage(self._userid, "移除成功" if self._api.delete_answer(self._question) == True else "移除失敗",
-            reply_markup=ReplyKeyboardMarkup(keyboard=[
-                ["首頁🏠", "回題目📜"],
-                ["登出🚪", "改密碼💱", "幫助📚"]
-            ], resize_keyboard=True))
-
-    def send_failed(self):
-        self._status = '正常使用'
-        bot.sendMessage(self._userid, "檔案不能超過 20 MB！上傳失敗",
-            reply_markup=ReplyKeyboardMarkup(keyboard=[
-                ["首頁🏠", "回題目📜"],
-                ["登出🚪", "改密碼💱", "幫助📚"]
-            ], resize_keyboard=True))
-
-    def list_passers(self):
-        self._status = '正常使用'
-        q = self._api.list_questions()[self._question]
-        q_str = "💁 <b>" + self._username + "</b> " + NAME + "\n"
-        q_str += "➖➖➖➖➖\n"
-        q_str += "📗" if q[1] == '期限未到' else "📕"
-        q_str += "<b>" + self._question + "</b> (DL: " + q[0] + ")\n [[" + q[3] + "]] [[" + q[2] + "]]"
-        q_str += "⚠️" if q[2] == '未繳' else "✅"
-        q_str += "<code>\n"
-        for passer in self._api.list_passers(self._question):
-            q_str += "\n" + passer
-        reply = bot.sendMessage(self._userid, q_str + "</code>", 
-            parse_mode='HTML',
-            reply_markup=ReplyKeyboardMarkup(keyboard=[
-                ["首頁🏠", "回題目📜"],
-                ["登出🚪", "改密碼💱", "幫助📚"]
-            ], resize_keyboard=True))
-        bot.sendMessage(self._userid, "點我到名單頂", reply_to_message_id=reply['message_id'])
-
-    def list_results(self):
-        self._status = '正常使用'
-        q = self._api.list_questions()[self._question]
-        q_str = "💁 <b>" + self._username + "</b> " + NAME + "\n"
-        q_str += "➖➖➖➖➖\n"
-        q_str += "📗" if q[1] == '期限未到' else "📕"
-        q_str += "<b>" + self._question + "</b> (DL: " + q[0] + ")\n"
-        for result in self._api.list_results(self._question, self._username):
-            q_str += "\n測試編號 <code>" + result[0] + "</code>："
-            q_str += "✔️ " if result[1] == '通過測試' else "❌ "
-            q_str += result[1]
-        bot.sendMessage(self._userid, q_str, 
-            parse_mode='HTML', 
-            reply_markup=ReplyKeyboardMarkup(keyboard=[
-                ["首頁🏠", "回題目📜"],
-                ["交作業📮" if q[1] == '期限未到' else '', "通過者🌐"],
-                ["登出🚪", "改密碼💱", "幫助📚"]
-            ], resize_keyboard=True))
\ No newline at end of file