1. We believe scientists will ______ a way to solve the problem of air pollution.

　　 A. set off　　　　 B. put off　　　　 C. come up with　　　 D. catch up with

　　 [解析]此题的句意是“我们相信科学家们将会想出解决空气污染的办法”。选项A是“出发”，B是“拖延、延期”，C是“想出、发现”，D是“赶上”。

100. He’s studied in that school ___ he came to China last year.

　　 　A, when　 B after　 C since　 D. as soon as

99. You must get here on time. ___ we will leave without you.

A.　 But　 B.　　　　 And　　 C. For　　　　 D. Or

98.The thief had stolen my wallet ___ I realized that.

A.　　　　 before　　 B. the moment　　　 C. while　 D .but

96. Hurry up, ___ you will be late for school.

　　　 A. and　　　 B. or　　 C. as　　 D. so that

97 I will tell him about it ___ he comes back.

　　　 A. as soon as　 B .until　　 C as　　 D. while

95. You won’t arrive at the station on time ___ you don’t hurry.

A.　　　　 when　 　B. because　　 C. until　　 D if

94. ___ the rain has stopped , let’s start again.

A.　　　　 That　　 B. As　　 C. When　　 D. Although

92. Don’t be afraid of asking for help ___ it is needed.

A.　　 unless　 B. since　 C. although　 D. when

90. He told me a new bridge ___ in his village the next year.

A.　　　 build　　 B. will build　　 C. will be built　 D. would be built

89. The doctor did what he could ___ that child.

A.　　　 　save　 B. to save　　 C. saved　　 D. saving