88.In the past 500 years the number of some rare plants and animals ________.

A. decreased　　　 B. has decreased　　 C. have decreased　　 D. had decreased

87. ______ two exams to worry about, I have to work really hard this weekend.

A. Besides　　 B. In addition to　　 C. With　　 D. Because of

86. Finding her car stolen, ________ .

A. a police was asked　　　　　　　　　 B. the area was searched thoroughly

C. she hurried to a policeman for help　　　 D. it was looked for everywhere

85. Suddenly, he ran back in the direction _______ he had come.

A. in which　　 B. from which　 C. after which　 D. for which

84.Either Jim or Tom was asked to send the papers yesterday. But I’m not sure

　 ________

A. it　　　　 B. whom　　　 C. who　　　 D. that

83. If you are not careful enough, you may ______ hit by a car.

A. have　　 B. go　　 C. become　　 D. get

82.After many days’ voyage, they arrived in ______ is called America now.

A. which　　 B. what　　 C. that　　 D. it

81. _______ , but I’ve also learnt some easy but effective ways to protect them.

A. Not have I only learnt a lot about eyes

B. Not only have I learnt a lot about eyes

C. Not only I have learnt a lot about eyes

D. Not only have learnt I a lot about eyes