67. The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.2007安徽　　 A. after　　　　 B. before　　　　 C. since　　　 D. when

66. He was told that it would be at least three more months　 he could recover and return work. 2007江西 　

A. when　　　　 B. before　　　 C. since　　 D. that

65. _______ most of the earth’s surface is covered by water, fresh water is very rare and precious. (06上海春季)

A. As 　　　　　　　　　 B. Once 　　　　　　　 　C. If 　　　　　　　　　　　 D. Although

64. In time of serious accidents，_____　we know some basic things about first aid, we can save lives. (06重庆)A. whether　　 　　　　 B. until　　　　　　　　　 　 C. if　　　　　 　 　 　 D. unless

63. If you are traveling 　　　the customs are really foreign to your own, please do as the Romans do.(06天津)

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

62. The cost of living in Glasgow is among the lowest in Britain, 　　　　the quality of life is probably one of the highest. ( 06天津 )　　 A. since　 　　B. when　 　　　C. as 　　　　D. while

61. --- Why didn’t you tell him about the meeting? 　 　--- He rushed out of the room　　　　 　I could say a word.　 ( 06四川 ) 　　A. before　　　　　 B. until　　　　 　　C. when　　　　　 　D. after

60. --- Mom, what did your doctor say? 　 　--- He advised me to live　　　　 　　the air is fresher.　 ( 06四川 ) 　　A. in where　　　　 　　　 B. in which　　 　 　C. the place where　　 D. where

59. My parents were quarrelling about me ____ I could not quite tell why. ( 06上海 )

A. since　　 　　 　　B. though　　 　　　　　　　 　C. if　　 　　　　　　 　　D. until

58. This is a very interesting book. I’ll buy it, __________. ( 06 陕西 )

A. how much may it cost　　　　 　　　　 B. no matter how it may cost

C. however much it may cost　　　 　　D. how may it cost