.

　　A. turning B. turned C. being turned D. having turned

　　26. If the food tastes nice, I’ll go to buy some more; _______, I won’t go.

　　A. if not

　　B. when not

　　C. if any

　　D. when ever

　　27. Failure hurts grown-ups and children___________, but it can make a positive contribution to your life once you learn to use it.

　　A. actively 　 B. likely

　　C. alike

　　D. similarly

　　28. After the quarrel, I tried all my best to fix the misunderstanding between us, but all my efforts seemed _____.

　　A. in trouble

　　B. in case

　　C. in effect

　　D. in vain

　　29. The one concern for parents and students is _______ the student pursues their university education in a foreign country, the student will not have the opportunity to establish social contacts in China.

　　A. that

　　B. that if

　　C. whether

　　D. how

　　30. ______ it have been the failure to pick up directions from the ground control that caused the air crash?

　　A. Must

　　B. Could

　　C. Would

　　D. Should

　　31.When it

　　air pollution, Beijing faces the three “C” s-----cars，coal and construction，which lead to Beijing's thick air pollution.

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