At that time people would starve if food was difficult _______, especially during the cold winter months.

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• 1Unless they are programmed by humans, computers are nothing more than big pieces of metal. But once _____ what to do, they show extraordinary power in carrying it out.

  A.taught

  B.teaches

  C.teaching

  D.to teach

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• 2She remained ______ for a while after the movie ended, which made others ______.

  A.sitting; puzzling

  B.sat; puzzled

  C.seated; puzzled

  D.seated; puzzling

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• 3If____________ , the polluted air can result in deadly diseases or even death.

  A.being breathed in

  B.having been breathed in

  C.breathed in

  D.breathing in

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• 4I want to know who________for the spoiled child.

  A.is to be blamed

  B.to blame

  C.should blame

  D.to be blamed

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• 5______ the call for help, the boys immediately rushed out to see what was going on.

  A.In order to hear

  B.Hearing

  C.Having heard

  D.They heard

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• 6______more effectively with foreign firms, many Chinese firms have turned to new technology．

  A.Being competed

  B.To compete

  C.Competing

  D.Competed

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• 7In the busiest season the peasants were seen _________ their tractors _________from morning till night.

  A.have, work

  B.have, working

  C.to have, working

  D.to have, be worked

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• 8He has a poor memory.He has forgotten _________ his dictionary while reading.

  A.carrying

  B.taking

  C.bringing

  D.to bring

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• 9They found the remains of buildings _______ under the sand, together with a lot of treasures.

  A.being buried

  B.buried

  C.to be buried

  D.burying

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• 10The Loisels did what they could ________ the debts.

  A.to pay off

  B.to pay for

  C.paid off

  D.paid for

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