4. Mr Hu told us to do our homework as (quick) as we could.

3. Stamps are used for (post) letters.

2. Many children are (interest) in modern robots.

1. Does your mother often make you (do) the housework at home?

2. — Are there any (硬币) in the box?   — No.

1.  (no matter what) you do,don't miss this chance.

19. 把机器人归还到……20. 太多的麻烦 

17. 看起来和新的一样 18. 做所有的家务活

15. 保存在垃圾箱里 16. 他的私人文件

13. 犯愚蠢的错误 14. 放在床上