When ________ in Arctic regions, the Aleuts construct igloos as temporary winter shelters．

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• 1She is writing a letter to a friend of hers, _______ him to attend the party.

  A.to invite

  B.having invited

  C.inviting

  D.invited

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• 2________ the exercises, she saved them in the disk．

  A.Typing

  B.Having

  C.Having typed

  D.After typed

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• 3The road is blocked by ________ trees．

  A.falling

  B.fallen

  C.being fallen

  D.having fallen

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• 4I am looking forward to ______ your answer as soon as possible.

  A.receiving

  B.being received

  C.receive

  D.be received

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• 5After ________ his homework, he went on to remember the new words．

  A.finishing

  B.finished

  C.is finished

  D.finish

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• 6While _______, he cut himself.

  A.shaved

  B.shaving

  C.was shaving

  D.was shaved

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• 7We can hardly imagine him ________ the hard work alone.

  A.to finish

  B.finishes

  C.is finishing

  D.finishing

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• 8In spite of his broken English, he can make himself ________.

  A.understand

  B.understanding

  C.understood

  D.to understand

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• 9I will try to persuade her ______ part in the competition.

  A.to take

  B.take

  C.taking

  D.took

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• 10You should speak louder to make yourself ______ by others.

  A.hear

  B.hearing

  C.heard

  D.to hear

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