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