Ⅰ. 根据句意及首字母提示完成单词（2分钟，10分）
1. He likes to play a j_____ on his classmates from time to time.
2. Not all teachers a_____ that spending too much time on the Internet is good for students.
3. Liu Xiang is an e_____ player.
4. Tom introduced h_____ to the people in the room.
5. I a_____ Jim and Jack’s advice.
