Section B:  Fill in the blanks with the words given in brackets. Make changes or add something where necessary. （共20小题，每小题1分，共20分）

29. Looking into crime and violence in the United States is like ______ (open) the proverbial can of worms.

30. We must now ______ (conclude) with further aspects of lateral and vertical thinking.

31. I had a chance to go out with a friend who ______ (take) a climbing course before he entered the university.

32. When might a doctor ______ (choose) not to tell a patient the truth?

33. Salads are good for you and you ______ (not have) to cook them.

34. The workers ______ (build) the bridge this time last year.

35. It’s only natural ______ (think) that through humor two different cultures could find some common ground.

36. Children have a natural ______ (curious) about the world around them.

37. Attractive men are ______ (confident) than less attractive men.

38. Every man and woman, old or young, ______ (be) required to take the inoculation.

39. Mr. Smith is responsible ______ (hire) painters for the company.

40. When we listen, we actually ______ (listen) a purpose.

41. Pubs are places ______ (which) people of all ages and social classes mix to talk.

42. I’d like to have these ______ (fragile, porcelain, Chinese) vases sent by special delivery.

43. She rarely visits her parents these years, ______ (she) ?

44. It’s so noisy here. Somebody ______ (turn) down the radio.

45. As a Christian, Mary’s mother goes to ______ (church) every Sunday morning.

46. My younger sister has to practice ______ (play) piano for hours every day for she will take part in a competition next month.

47. I don’t know ______ (who) I ought to address the request.

48. The old worker is retiring and the factory needs a younger ______ (take) over.