Plastic bags are provided for our convenience but they have also __________ the pollution of the environment.

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• 1Reportedly yesterday a group of American soldiers were walking along the street in Iraq whena bomb was ____ , three of whom were killed.       

  A.set off

  B.set out

  C.set up

  D.set about

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• 2In order to keep fit, I _____ in the park every morning.  

  A.work on

  B.work at

  C.work out

  D.work with

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• 3We have a high regard for Mr. Black because he always tries to ________ his principles.

  A.live up to

  B.look forward to

  C.catch up with

  D.put up with

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• 4He had to take the medicine three times a day, so as to be _____ the pain in the leg.

  A.far from

  B.away from

  C.apart from

  D.free from

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• 5— The water was left running all night long.— Yes. It seemed that John _____.He was the last one to leave the lab.

  A.was to be blamed

  B.was to blame

  C.had been blamed

  D.should be blamed

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• 6Before the job of teaching ______, families had been responsible for the education of the young.

  A.came to light

  B.came into being

  C.came to itself

  D.came into effect

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• 7In China the needle treatment _______ancient times.     

  A.dates from

  B.dates back

  C.dated backed to

  D.dated from

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• 8— Mum, I can't see any point in studying hard.— Come on. dear,Years of hard study will surely _______ in your future career.

  A.make sure

  B.pay off

  C.bring backD .pay back

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• 9A big bush fire ___ in Australia last night, but fortunately everyone ____escape.

  A.took place; could

  B.happened; can

  C.broke out; was able to

  D.happened; could

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• 10In our country the cold weather in the north_____ sharply _____the hot weather in the  south.   

  A.combines; with

  B.relates; to

  C.compares; with

  D.contrasts; with

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