33. If you want to do the experiment again, you’d better be more careful ____ you made a mistake.

　 A. when　 B. why　 C. where　 D. in case

32. I’d appreciate ____ if you could turn the radio down.

　　 A. that　 B. it　 C. this　 D. you

31. We must take measures to protect endangered wildlife___ it is too late.

　　 A. now that　 B. as long as　 C. unless　 D. before

30. A television programme ______ “Kim’ll fix it” invites viewers to say what they really want to do.

　 A. being called　 B. having been called

　 C. calling　　　 D. called

29. The little boy ______ asleep while watching TV. His mother carried him to bed.

　 A. had fallen　 B. fell　 C. was falling　 D. would fall

28. ---Hi, Ruby, but we never thought we could see you at this corner of such a big city.

　 --- ______. Neither did I.

　A. It’s a small world.　　　 B. But that’s Ok.

　C. Very glad to see you.　　 D. How lucky.

27. ---I rang you at about nine, but there was no reply.

　 ---Oh, that was probably ____ I was in the doctor’s office.

　 A. why　 B. when　 C. what　 D. that

26. _____ in the collapsed mine for 7 days, the workers were saved.

　 A. To have been trapped　　 B. To be trapped

　 C. Having been trapped　　　 D. Being trapped

25. ---Oh, I saw Mr. Francis Mathews at Jane’s birthday party yesterday.

　 ---You _____. He has been on business in Shanghai for a week and I telephoned him the same day.

　　 A. You couldn’t　　　 B. You can’t have

　　 C. You mustn’t have　 D. You shouldn’t

24. Here is the invitation list. Please telephone everyone and _____the names of the people who are not coming.

　　 A. cut down　 B. cross out　 C. keep on　 D. make up