31. We hope the measures to control prices, ______ are taken by the government, will succeed.

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

30.　 Each player of　 chess is trying to trap the other player’s king into a position ______ escape is impossible.

A. when　　　　 B. that　　　　 C. in which　　　　 D. from which

29.　 They stood at the window, ______ they could see ______ was happening in the street.

A. where; all　　 B. which; all　　 C. from where; what　　 D. from which

28.　 Mr. Green will come to the party on Sunday, ______ he promised to every one of us.

A. when　　　 B. that　　　　 C. where　　　　 D. which

27.　 We will go to the countryside at the beginning of June, ____ the summer harvest will start.

A. if　　　　　 B. when　　　　　 C. which　　　　 D. while

26.　 I’ll take you to the newly-opened museum ______ you may see ______you want.

A. which; that　　 B. where; that　　 C. in which; which　 　D. where; what

25.　 John swims very well, but I don’t like the way ______ he always shows off in public.

A. which　　　　 B. how　　　　　 C. when　　　　　 D. /

24.　 I think you will never find such a man ___ you described because he doesn’t seem to exist.

A. which　　　　 B. that　　　　 C. as　　　　 D. what

23.　 Is this the reason ______ at the meeting for his carelessness in his work?

A. he explained　 B. what he explained　 C. how he explained　 D. why he explained

22.　 ______ is known to everybody, the moon travels round the earth once every month.

A. It　　　　　 B. As　　　　 C. That　　　　　 D. What