The United States _______one of the lowest smoking rates －25.5 percent of the population.

试卷相关题目

• 1One third of the class _____ agreed to be volunteers to help the aged this vocation.

  A.are

  B.is

  C.has

  D.have

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• 2I'm not familiar with this place. It's the first time I _____ here, you know.

  A.am

  B.was

  C.have been

  D.had been

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• 3The classroom is so dirty that it needs________ badly.

  A.clean

  B.to clean

  C.being cleaned

  D.cleaning

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• 4If Newton lived today, he would be surprised by what _______ in science and technology.

  A.had discovered

  B.had been discovered

  C.has discovered

  D.has been discovered

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• 5I insisted that a doctor _______ immediately.

  A.has been sent for

  B.sends for

  C.be sent for

  D.will be sent for

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• 6When the old man__＿___to walk back to his house，the sun__＿＿__itself behind the mountain．

  A.was starting；hid

  B.had started；had already hidden

  C.had started；was hiding

  D.started；had already hidden

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• 7For more than a decade, experts from across the globe ________ on the cure of the disease that way.

  A.worked

  B.are working

  C.have been working

  D.were working

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• 8The man insisted that he __＿＿_ innocent.

  A.was

  B.should be

  C.be

  D.were

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• 9---Are you happy about your present job? --- Why shouldn't I ? I _____ as much , and I enjoy more.

  A.am earning

  B.earn

  C.earned

  D.have earned

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• 10-I saw Jane and her mother in the shop around eight yesterday evening.  -Impossible. She___＿___TV with me in my home then. 

  A.is watching

  B.was watching

  C.has watched

  D.had watched

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