This problem may lead to more serious ones if _____ unsolved.

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• 1________ polite to others and you can get friendship in turn.

  A.Be

  B.To be

  C.Being

  D./

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• 2----Have you got any particular plans for the coming holiday? ----Yes. ________ , I'm going to visit some homes for the old in the city.

  A.If ever

  B.If busy

  C.If possible

  D.If anything

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• 3We are always told that only through hard work ________ our goals in our study.

  A.we will achieve

  B.we have achieved

  C.have we achieved

  D.will we achieve

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• 4Only when the war was over _______ return to his hometowns．

  A.have the soldiers

  B.the soldiers

  C.the soldiers did

  D.did the soldiers

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• 5Not until the train pulled into the station ________ that his suitcase was gone.

  A.did he find

  B.had he found

  C.he had found

  D.he found

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