The problem will appear ________ a different welfare system will be created.  

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• 1In the global economy, a new drug for cancer,________ it is discovered, will create many economic possibilities around the world.

  A.whatever

  B.whoever

  C.wherever

  D.whichever

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• 2He was told that it would be at least three more months _______he could recover and return to work.

  A.when

  B.before

  C.since

  D.that

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• 3A number of high buildings have arisen ______ there was nothing a year ago.

  A.when

  B.where

  C.before

  D.until

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• 4This problem may lead to more serious ones if ______ unsolved.

  A.making

  B.remained

  C.keeping

  D.left

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• 5Modern science has given clear evidence ______ smoking can lead to many diseases.

  A.what

  B.which

  C.that

  D.where

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• 6He made a promise ________ anyone set him free he would make him very rich.

  A.that

  B.if

  C.what

  D.that if

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• 7 ________ printed, this science fiction will be popular among the students.

  A.Before

  B.Unless

  C.When

  D.Once

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• 8Suggestions have been put forward ________ guns should be more strictly controlled in the US

  A.A.before

  B.that

  C.when

  D.as

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• 9It's such a good place _______ everyone wants to go and visit _______ it is well-known all over the world.

  A.that; that

  B.as; as

  C.as; that

  D.that; as

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• 10I hear that _________ she is lovely she can be extremely difficult to deal with.

  A.whether

  B.as if

  C.if

  D.While

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