1.A year later，with the nation‘s economy ________， Bush’s approval rating dropped below 40 percent.

A. in power

B. in trouble

C. in hand

D. in part

2.There is the appreciation of the salient historical truth ________ the aging of advanced societies has been a sudden change.

A. which

B. what

C. that

D. how

3.Robots differ from automatic machines ________ after completion of one specific task，they can be reprogrammed by a computer to do another one.

A. in case

B. in that

C. in which

D. in time

4.Basically，these attitudes amount to a belief ________ leisure can and should be put to good use.

A. which

B. that

C. what

D. how

5.The professor worked for 7 hours at a ________.

A. stretch

B. extend

C. expand

D. prolong

6.If an earthquake occurred，some of the one-storey houses ________.

A. might be left stand

B. might leave to be standing

C. might be left to stand

D. might be left standing

7.________， he had no time to rest.

A. As he was tired

B. If he was tired

C. Tired as he was

D. Now that he was tired

8.Since we have a focused subject， we should not talk ________.

A. at once

B. at hand

C. at intervals

D. at random

9.Why do you blame him for his poor judgment on the matter ______ he really needs is encouragement?

A. when that

B. since that

C. when what

D. now that

10.The doctors are ________ about the guidelines under which they can carry out euthanasia.

A. at a stretch

B. at a loss

C. at random

D. at length

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