A new study has found no evidence that the sunscreen, commonly used to reduce the risk of skin cancer,actually____ the risk.

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• 1A large number of students in our school ______ from the countryside, the number ____ growing these years.

  A.is, has been

  B.are; has been

  C.is, have been

  D.are, have been

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• 2In this university a medal with ten thousand dollars ____ gains success in science and technology every two years.

  A.is given to whoever

  B.are given to anyone who

  C.gives to whomever

  D.give to everyone

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• 3Gone are the days when China, a major economic power in Asia today, ________ at the mercy of others.

  A.was

  B.is

  C.had been

  D.were

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• 4I took mathematics and physics because I think that _______very important for me to make furtherresearch in this field.    

  A.that is

  B.they are

  C.this

  D.which are

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• 5After ______ absence, he found his wife much changed.   

  A.a year’s or two’s

  B.a year of two

  C.a year or two’s

  D.one of two year’s

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• 6The article suggests that when a person _____ under unusual stress he should be especially  careful to have a well-balanced diet.

  A.is

  B.be

  C.were

  D.was

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