The United States of America _____one of the most developed countries in the world.

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• 17、Every possible means ______ to prevent the air pollution, but the sky is still not clear.

  A.is used

  B.are used

  C.has been used

  D.have been used

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• 2 What we want_____good textbooks.

  A.have

  B.has

  C.is

  D.Are

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• 3. Cattle ______ on the hillside.

  A.grazes

  B.is grazing

  C.was grazing

  D.were grazing

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• 4That is one of those books that ____ worth reading.

  A.is

  B.are

  C.has

  D.have

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• 5 All but him and me ______ to the exhibition.

  A.am going

  B.is going

  C.are going

  D.was going

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• 6Writing stories and articles _____what I enjoy most，

  A.is

  B.are

  C.was

  D.were

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• 7. The public ______ generous in their contributions to the earthquake victims.

  A.is

  B.was

  C.are

  D.has been

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• 8Either you or any of your family ______ to attend the important banquet that is due tomorrow.

  A.are

  B.can

  C.have

  D.is

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• 9One and a half bananas ____ left on the table.

  A.is

  B.are

  C.has

  D.have

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• 10The number of deer, mountain lions and wild roses ____ much if people leave things as they are.

  A.doesn't change

  B.don't change

  C.change

  D.changed

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