Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.

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• 1She was told to wear flat shoes ______ her back problem.

  A.on account of

  B.regardless of

  C.in terms of

  D.in case of

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• 2The two companies are competing _________ each other to get into the Chinese market.

  A.to

  B.for

  C.in

  D.against

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• 3I was standing behind a tall man．When the man looked _____, I recognized him at once．

  A.up

  B.down

  C.forward

  D.about

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• 4_____ learn more knowledge, the students stay at school on Sunday.

  A.In order to

  B.So as to

  C.In order that

  D.So that

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• 5He made a lot of mistakes ______ carelessness.

  A.due to

  B.along with

  C.but for

  D.instead of

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• 6Before the tourists set off , they spent much time setting a limit _____ the expenses of the trip.

  A.in

  B.for

  C.to

  D.about

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• 7The person sitting opposite _____ Mr．Smith is our new manager．

  A.to

  B./

  C.with

  D.of

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• 8Although this medicine can cure you ______ your illness, it has a bad effect____you.

  A.for; in

  B.for; on

  C.of; on

  D.of; at

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• 9The computer system proved to be powerful ______ some shortcomings.

  A.by way of

  B.in case of

  C.as a result of

  D.in spite of

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• 10---Can you tell me what role a mobile phone______ in our daily life? --Of course.

  A.makes

  B.exchanges

  C.plays

  D.does

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