Every packet of cigarettes contains  poisonous chemicals that can  ____ lung cancer and   heart disease.     

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• 1Many of the world's plants and animals have already _______ , and several other species are endangered.     

  A.died away

  B.died out

  C.died down

  D.died off

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• 2—Jack can't concentrate on his lessons recently.   — Yes, that might____why he did so badly in the last test.     

  A.answer for

  B.apply for

  C.account for

  D.call for

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• 3— I'm surprised to  hear that Sue and Paul have ____.  — So am I. They seemed very happy together when I last saw them.     

  A.broken up

  B.finished up

  C.divided up

  D.closed up

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• 4We must do something to _____ the factories sending out   poisonous gases so as to keep the city_____.       

  A.keep; being polluted

  B.keep; from being polluted

  C.prevent; being polluted

  D.prevent; from being polluted

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• 5Mary's illness ____ her absence. So don't scold her.    

  A.showed

  B.accounts for

  C.explains

  D.gives out

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• 6The headmaster won't have students ____  cheating in the exam.      

  A.getting away from

  B.getting away with

  C.getting down to

  D.getting out of

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• 7The speed of cars and trucks is _____ 30 kilometers per hour in large cities in Chin

  A.A.limited

  B.limiting

  C.limiting to

  D.limited to

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• 8Mike pretended _____ his homework when mother came.   

  A.to do

  B.have done

  C.did

  D.to be doing

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• 9The early pioneers had  to_____ many hardships to settle on the new land.   

  A.go along with

  B.go back on

  C.go through

  D.go into

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• 10Tricks are often ____  those who don't look clever or smart.

  A.laugh at

  B.greeted

  C.played on

  D.made to

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