81.　 New York is famous for its sky-scrapers, ___ is over 100 storeys. A. the high of which 　　　　　　　　　　　 B the height of them C. the height of which 　　　　　　　　　　 D. the height of whose

80.　 This is the train ___ we went to Nanjing the other day. A. in which　　　 B. by that　　　　　　　　　　　　　　　　 C. to which　　　　　　 D. where

79.　 I have found a man ___ can help us. A. who　　　　　　　 B. whom　　　　　　　　 C. whose　　　　　　　　 D. he

78.　 The hotel ___ they are staying is very expensive. A. of which　　　 B. at that　　　　　　　　 C. at which　　　　　　　 D. in that

77.　 The old lady has two sons, one ___ is a teacher. A. of them　　　　 B. of which　　　　　　 C. of whose　　　　　　 D. of whom

76.　 The room ___ we live is not large enough for us three boys. A. which　　　　　 B. on which　　　　　　 C. at which　　　　　　　 D. in which

75.　 Her English, ___ used to be very poor, is now excellent. A. that　　　　　　　 B. which　　　　　　　　　 C. it　　　　　　　　　　　　 D. whose

74.　 You can take any seat ___ is free. A. that　　　　　　　 B. which 　　　　　　　　　　　　　　　　 C. where　　　　　　　　　 D. in which

73.　 There are 103 elements ___ in nature, ___ are metals. A. finding; most of them　　　　　　　　　 B. found; most of which C. having been found; most of that　 D. having found; most of which

72.　 Some of the roads were flooded, ___ made our journey more difficult. A. that　　　　　　　 B. it　　　　　　　　　　　　 C. which　　　　　　　　　 D. as