52. This is the third week _____ the dustmen haven’t come for the rubbish.

　 A. that　　　　 B. when　　　　 C. which　　　 D. on which

51. He paid the boy $10 for washing ten windows, most of _____ hadn’t been cleaned for at least a year.

　 A. these　　　 B. those　　　　 C. that　　　 D. which

50. His parents wouldn’t let him marry anyone _______ family was poor.

　 A .of whom　　 B. whom　　　　 C. of whose　 D. whose

49. The way _____ you are doing it is completely crazy.

　 A. that　　　　 B. which　　　　 C. as　　　　 D. what

48. The lady ____ is a woman scientist.

　 A.whom you spoke B. with which you spoke C.whom you said to D.you spoke to

47. This is the first play _____ I have seen since I came here.

　 A. which　　　 B. that　　　　 C. as　　　 D. what

46. This is the best novel _______ I have ever read.

　 A. which　　　 B. what　　　　 C. as　　　 D. that

45. You can take any books ______ you like.

　 A. which　　　 B. that　　　　 C. as　　　 D. what

44. The only problem ______ troubled him has not been solved.

　 A. which　　　 B. that　　　　 C. as　　　 D. what

43. This is the best hotel in the city ____ I know.

　 A. which　　　 B. that　　　　 C. where　 D. it