19. Safety; at present; It’s dangerous　 20. amazed/surprised at

17. are supposed to　　 18. too much; much too　

14. cook; cooks　　 15. look; look　 16. think of; stand　　

11. Keep off　 12. through; with　 13. kind of/a bit/a little　

9. more exercise; less; fit　 10. across from

7. favorite subject; What/How about　 8. waiting for; at　

4. take; bring; dictionary　 5. more than; take part in　　 6. join; art club

50. 请你不要乱扔垃圾好吗?我们应该保持我们的街区整洁干净。

　　　 Would you ______ ______ litter about? We should keep our neighborhood __________.

Key:Ⅰ. 1. e-mail address; number　 2. difference between; in　 3. Lost and Found

49. 自九点开始他一直在滑冰,他已经滑了三个小时了。

　　　 He has been skating _______ nine o’clock and has been skating ________ three hours.

48. 李云笛也成了70年来首位赢得此奖项的中国钢琴家。

　　　 Li Yundi was also the first Chinese pianist in the _______ history of the Competition ______ _______ this prize.