28. You’ve switched the machine off. I told you not to,_____?

A.didn't I　 B.haven't you　 C. will you　　 D. did I

27. We have been told that under no circumstance_____ the telephone in the office for personal affairs.

A.may we use　 B.we may ring　

C.we could borrow　 D.did we answer

26. The door opened and in _____.

A. he came　 B. came he　 C. did he come D. did Mr Smith come

25.--- He has to finish the experiment today. He must be in the lab,____?

---That s quite possible.

A. mustn't he　 B. won't he　 C. doesn't he　 D. isn't he

24. --Will you two go to the show tomorrow?

---No. We're going to a lecture, or at least I'm planning ____.

A. it　 B. to　 C. that　 D. so

23.- I like football.

- ______ my sister and me.

A.So do　 B.So are　 C.So did　 D. So it is with

22. “Alice, you feed the bird today, _________?” “But I fed it yesterday.”

A. do you　　　 B. will you　　　 C. didn’t you　 D. don’t you

21. 　“What made you so upset?” “_________ my wallet.”

A. Lost　　 B. Losing C. Having lost D. Being lost

19. -I don’t like him, ______?

-No, I don’t at all.

A. do I　　 B. do you　　　 C. don’t I　　　 D. does she

20 “What made her so happy?”　 “_________ her son passed the college entrance examinations.”

A. That　 B. 不填　 C. Since　 D. For

18. It was ______ back home after the experiment.

A. not until midnight did he go　　　 B. until midnight that he didn’t go

C. not until midnight that he went　 D. until midnight when he didn’t go