We must know what we should do and what we should avoid ______a good impression on others in public place.

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• 1We must do something to ________ the factories sending out poisonous gases so as to keep the city clean and beautiful.

  A.keep

  B.protect

  C.permit

  D.prevent

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• 2When he came to life, he found himself ______ to a tree.

  A.tied

  B.being tied

  C.to be tied

  D.having tied

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• 3When first ________ to his new classmates, the little boy felt shy and said nothing.

  A.introducing

  B.introduced

  C.introduce

  D.being introduced

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• 4Tom has been out of work for two years, so he has difficulty______.

  A.earning living

  B.earning his living

  C.to earn livings

  D.to earn his living

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• 5_____ with terror, the dog hid himself in a small cave, _____ his tail to the rain.

  A.Trembling; exposed

  B.Trembled; exposed

  C.Tremble; exposed

  D.Trembling; exposing

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• 68 Researchers have shown that the shorter the index finger is, __________ the ring finger, _________ aggressive men are likely to be.

  A.compared with; more

  B.comparing to; more

  C.compared to; the more

  D.comparing with, the more

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• 7Beibei, ________ back to the Song Dynasty, was once again made top in a list of “the cleanest districts (区域) of Chongqing” recently.

  A.dated

  B.dates

  C.dating

  D.had dated

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• 8They will start their project ____at helping the poor children to be educated in China＇s west.

  A.aims

  B.aiming

  C.being aimed

  D.aimed

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• 9---She's feeling very sad over_________ of school trip tomorrow. ---So would you if you fell ill on such an occasion.

  A.leaving out

  B.to be left out

  C.to leave out

  D.being left out

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• 10She can't help ______ for her family often, so she can't help ______ why life is so hard.

  A.working ; wondering

  B.work ; wondering

  C.working ; wonder

  D.to work ; to wonder

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