56. The passenger must have had an accident; _________ he would have arrived by that time.

　　A. therefore B. otherwise

　　C. so D. nevertheless

　　57. My neighbors have painted their houses, ________ , of course, makes my house looks much shabbier than it really is.

　　A. that B. what

　　C. which D. who

　　58. My sister’s nose quivered a little at the tip, ________ when she is excited over anything.

　　A. as always as it does B. as it always is

　　C. always as it does D. as it always does

　　59. In 1984, President Ronald Reagan proposed that the United States _________ a launch laboratory for a new era of space exploration.

　　A. construct B. constructs

　　C. constructed D. will construct

　　60. Traditional Chinese medicine is famous for using herbs ________ healing properties.

　　A. in B. on

　　C. with D. between

　　61. Animals are quite different from human beings _________ animals have no aptitude for language learning.

　　A. in which B. in what

　　C. in that D. in how

　　62. You _________ yesterday if you were really serious about this project.

　　A. ought to come B. ought to be coming

　　C. ought to have been coming D. ought to have come

　　63. The chairman of the department, together with some other teachers, _________ a conference for the purpose of laying down certain regulations.

　　A. is planning B. are planning

　　C. plan D. have planned

　　64. Traffic police have to make decisions __________ .

　　A. on the spot B. on business

　　C. on purpose D. on the watch

　　65. Medicine should not be kept __________ it is approachable to children.

　　A. when B. where

　　C. which D. that