31．　　　 Sometimes _________ happens that a person is in a position _________ he can make a decision about his enemy’s fate.

A. it; which　　 　 B. /; that　　　 　 C. it; where　　 　 D. which; where

30．　　　 _________ you make a decision, you should _________ advantages against disadvantages.

A. When; compare　 　　　　 B. Before; weigh　 　　

C. After; compare 　　　　　　 D. While; weigh

29．　　　 In this country a medal with ten thousand dollars _________ gains success in science and technology every 2 years.

A. give to everyone　 　　　 B. are given to anyone who

C. is given to whoever　　 　　　 D. gives to whomever

28．　　　 He began to try every material _________ the best way to work it out.

A. known to find　 　　　　　 B. knowing to find 　　

C. knowing finding 　　　　　 D. known finding

27．　　　 _________, Helen couldn’t get the door open.

A. Might as she try 　　　　　 B. As she might try 　　

C. She might as try 　　　　　 D. Try as she might

26．　　　 -_________ was it _________ they discovered the entrance to the underground palace?

-Totally by chance.

A. How; that　　 　　　　　　 B. What; that　

C. When; when　 　　　　　　 D. Where; that

25．　　　 He said he would come before sunrise; he didn’t, _________. I will never trust him any longer.

A. either　 　　 B. though　　 　　　 C. still　 　　　 D. then

24．　　　 It took a few seconds for her eyes to _________ the darkness.

A. aim at　　　 B. throw light upon 　 C. rely on　　 　　 D. adjust to

23．　　　 I promise that you _________ have 20 dollars if you clean all the windows.

A. will　　　　 　　 B. would　 　 C. should　 D. shall

22．　　　 -Excuse me, could you tell me the way to Chao Tianmen Square?

-Sorry, I’m a stranger here.

-___________.

A. Thanks, anyway　　　　　　 B. It doesn’t matter 　　　　

C. Never mind　 　　　　 D. No problem