52. I have two grammars, ___are of great use.

A. all of which 　B. either of which 　C. both of that 　　D. both of which

51.That is not the way ___ I do it.

A. /　 　B. which　 　C. for which　 　D. with which

50. He is working hard, ___ will make him pass the final exam.

A. that B. which C. for which D. who

49. The reason ___ he didn't come was ___ he was ill.

A. why; that 　　B. that; why　 　C. for that; that　 　　D. for which; what

48. This machine, ___ for many years, is still working perfectly.

A. after which I have looked　　　 　　　B. which I have looked after

C. that I have looked after 　　　　　　　D. I have looked after

47. This is the reason ___ he didn't come to the meeting.

A. in which 　　B. with which 　　C. that　 　D. for which

46. The way ___ he looks at problems is wrong.

A. which　 　B. whose C. what 　　D. /

45. I can never forget the day ____ we worked together and the day ___ we spent together.

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

44. I have bought such a watch ___ was advertised on TV.

A. that　 　B. which 　　C. as 　　D. it

43. Last summer we visited the West Lake, ___ Hang Zhou is famous in the world.

A. for which 　B. for that 　C. in which 　D. what