35. Most parents encourage their children to take an active part in school events _________ those events do not have a bad effect on their studies.

　　 A. unless　　　　　　　 B. if

　　 C. though　　　　　　　　　　 D. but

34. Their answers are exactly the same; one of them _________ from the other.

A. must copy　　 B. must have copied

C. should copy　　 D. should have copied

33. －I think it’s going to be a big problem.

　　 －Yes, it could be. I wonder __________ we can do about it.

　　 A. what　　　　　　　　 B. that

　　 C. if　　　　　　　　　　　 D. how

32. Nowadays, teenagers like to go to the fast food restaurant, __________ eating doesn’t take much time.

　　 A. which　　　　　　　 B. who

　　 C. what　　　　　　　　 D. where

31. －How many people were there in the Reading Hall when you left?

　　 －_________. I locked the door.

　　 A. No one　　　　　　　　　　 B. Nobody

　　 C. No person　　　　　　　　 D. None

30. Summer is coming. More and more people are wearing sunglasses to _________ their eyes ___________ the strong sunlight.

　　 A. guide…from　　　　　　　　　 B. prevent…against

　　 C. protect…from　　　　　　　　　 D. keep…against