1. It is difficult to imagine his _____________ the decision without any consideration.

A. accept　 　　　　　　　　　　　 B. accepting 　　　　　　　　　　　 C. to accept 　　　　　 D. accepted

20. ____ we are developing new technology at such a high pace ,the true challenge is to find new ways of using it.

A. Although　　　　　　　　 B. After　　　　　　　　　　　　 C. As soon as 　　　　　　 D. Now that

19.　　 you’ve understood all these rules，you’ll have no further difficulty.

A. Unless　　　　　　　　　　 B. Although 　　　　　　　　 C. Until 　　　　　　　　　　 D. Once

18. ______ time, animals have developed many ways to stay away from their enemies.

A. Through　　　　　　　　 B. On　　　　　　　　　　　　　 C. By 　　　　　　　　　　　 D. Over

17. Let me say sorry to her? No way! I would die I apologize to her!

A. after 　　　　　　　　　　 B. before 　　　　　　　　　　 C. until 　　　　　　　　　　 D. while

16.--Why didn’t you tell him about the result of the test?

　 --He rushed out of the room ______ I could say a word.

A. before　　　　　　　　　　 B. until　　　　　　　　　　　　 C. when　　　　　　　　　　　 D. after

15.________ both sides accept the agreement will a lasting peace be established in this region.

A. Unless 　　　　　　　　　 B. As long as　　　　　　　　 C. If only 　　　　　　　　　 D. Only if

14. Wild animals ________ tigers and pandas are becoming rare.

A. as follows　　　　　　　 B. for example 　　　　　　 C. such as 　　　　　　　　 D. for instance

13. They got two free tickets to Canada, ____ they’d never have been able to afford to go.

A. as a result 　　　　　　 B. otherwise 　　　　　　　　 C. therefore 　　　　　　　 D. at last

12. I hope you’ve got you own car, _________if you haven’t we may have to hire one.

A. because　　　　　　　　　 B. so that　　　　　　　　　　　 C. ever since 　　　　　　 D. when