36. Suffered such heavy pollution already, it may now be too late to clean up the river.　

35. It is generally believed that teaching is so much an art as it is a science.　

34. She was feeding the dog to bread. 　

33. This gave birth in private property and led to differences of rich and poor.　

32. We put a fence round the garden to keep the chickens away.　

31. The children surrounded the old man were listening to him telling the old stories.　

30. If______ , the experiment will be successful.　

　　　 A. carefully doing　　　　　　　　　　　　　　　 B. it done carefully　

　　　 C. carefully done　　　　　　　　　　　　　　　　 D. doing carefully　

　　　 答案:C

　　　 解析:状语的逻辑主语为“the experiment”，与done构成被动关系。

29. A house built of stones lasts longer than______ built of wood. 　

　　　 A. it　　　　　　　　　　　 B. that　　　　　　　　　 C. one　　　　　　　　　　　　　 D. the one　

　　　 答案:C

　　　 解析:one=a house。

28.-Could you pass me the book?

　　　 -Sorry, I______ .Would you please say it again?

　　　 A. haven’t listened　　　　　　　　　　　　　　 B. hadn’t listened　

　　　 C. don’t listen　　　　　　　　　　　　　　　　　　 D. wasn’t listening　

　　　 答案:D

　　　 解析:表示“刚才你说的时候我不在听”。

27.-It is said that Mary was caught stealing in a supermarket.　

　　　 -It just doesn’t______ true. Why would she do a thing like that?

　　　 A. come　　　　　　　　 B. make　　　　　　　　 C. sound　　　　　　　　　　　 D. like　

　　　 答案:C

　　　 解析:sound true“听起来像真的”。