72. Great changes have taken place in the small town, ______ the famous writer spent his childhood.

　 A. where　　 B. when　　　 C. that　　　 D. in the town

71. They are flying to Hong Kong, ______they plan to visit for two or three days.

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

70. Do you understand the theory ______ ?

A.　　 that how the living things came into being

B.　　 how did the living things come into being

C.　　 of how the living things come into being

D.　　 of how did the living things come into being

69. China has thousands of islands, ______ the largest is Taiwan.

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

68. My father bought me several books, but _____ was interesting.

　 A. most of them　 B. none of them　 C. none of which　 D. neither of which

67. The buses, _____ were already full, were surrounded by an angry crowd.

　 A. most of them　　　 B. most of that　　 C. most of which　　 D. that

66. These days _____ we spent together cannot be easily forgotten.

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

65. The days ______ we worked together cannot be easily forgotten.

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

64. We are going to visit the school ______ you went to last time.

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

63. I’m going to visit the factory ______ your brother worked a few years ago.

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