8.　　 If you don’t work hard, you’ll 　　　　(考试不及格).

7.　　 In summer I often 　　　　(冲澡) before I go to bed.

6.　　 Most garbage will 　　　　(变成)soil some day.

5.　　 What will you do when you 　　　　(用完) your paper?

4.　　 You 　　　　(最好) put your coat. It’s a bit cold outside.

3.　　 Please 　　　　(取出) one pencil from your pencil case.

2.　　 Have you ever 　　　　(出国)？

1.　　 Who are you 　　　　(等待)？

20. You’d better not 　　　(do) that.

19. He asked me 　　　(hold) on while he left the telephone to get a pen.