Not easy as the problem of pollution is ____, no one should just stop trying.

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• 1With a lot of problems _____, the president is very busy every day and hasn't had a good rest.

  A.solving

  B.to solve

  C.solved

  D.having solved

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• 2— Why shall we have a meeting this afternoon?—  ______ the solution to the problem.

  A.To hunt for

  B.Hunting for

  C.Having hunted for

  D.So as to hunt for

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• 3— Why are we always having examinations?— _____ whether we have grasped the knowledge in every subject.

  A.Test

  B.Testing

  C.To test

  D.Tested

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• 4Mr Green stood up in defence of the 16-year-old boy，saying that he was not the one _____.

  A.blamed

  B.blaming

  C.to blame

  D.to be blamed

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• 5What is the way George thought of ______ enough money to buy the house?

  A.to get

  B.getting

  C.having got

  D.being got

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• 6I heard from my old friends just now and I was eager _____ the letter to read it.

  A.unfolding

  B.to fold

  C.folding

  D.to unfold

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• 7Simon made a big bamboo box _____ the little sick bird till it could fly.

  A.keep

  B.kept

  C.keeping

  D.to keep

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• 8When he _____ the door, he found his keys were nowhere.

  A.would open

  B.opened

  C.had opened

  D.was to open

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• 9An offer of a reward has caused many students in our school _____ actively in the competition.

  A.participate

  B.participated

  C.participating

  D.to participate

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• 10Helen had to shout _____ above the sound of the music.

  A.making herself hear

  B.to make herself hear

  C.making herself heard

  D.to make herself heard

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