63. This is the most important chapter ______ we should pay attention.

A. to whom　 B. in which　 　C. at which　 D. to which

62. China has hundreds of islands, ________ the largest is Taiwan.

A. in which　 B. at which　 C. of which　 D. which

61. The radio I bought yesterday is quite different from _____ you bought last month.

A. that　 　B. which　 C. the one　 D. the one what

60. I , ______ your good friend, will try my best to help you out.

A. who is　　 B. who am　 C. that is　 D. what is

59. He has two sons, _______ work as chemists.

A.　　 two of whom　 B. both of whom　 C. both of which　 D. all of whom

58. Is this museum _____ some German friends visited last Wednesday ?

A. that　 B. where　 C. in which　 D. the one

57. Please pass me the dictionary ______ cover is black.

A. which　　 B. which of　 C. its　 D. whose

56. A child ______ parents are dead is called an orphan.

A. who　 B. who’s　　 C. whose　 D.　 which

55. You can take any seat _______ is free .

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

54.I’ve read all the books ______ were borrowed from the library.

A. that　 B.　 x　　 C. which　 D. they