Over the past decades, sea ice _______ in the Arctic as a result of global warming.

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• 1Prices ________ all the time and no one knows when they ________ stable.

  A.are going up; become

  B.have been going up; will become

  C.have gone up; will become

  D.have been gone up; become

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• 2The little boy________in the mud all morning.No wonder he is dirty from head to foot.

  A.has played

  B.is playing

  C.has been playing

  D.was playing

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• 3Unrest and violence in North Africa and the Middle East ____ at their fastest rate since 2008.   [     ]

  A.have been raising

  B.have been rising

  C.have raised

  D.have risen

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• 4—Did you find the missing couple in the mountain yesterday?—No,but we _____ to get in touch with them ever since.

  A.have tried

  B.have been trying

  C.had tried

  D.had been trying

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• 5— Come on,Kitty.— Oh, good heavens! Both my legs are nearly to give out. I_______ for hours like a dog.

  A.have been walking

  B.had walked

  C.was walking

  D.walked

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• 6The secretary________letters all the afternoon and there are still two letters to finish.

  A.is typing

  B.had type

  C.has been typed

  D.has been typing

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• 7— That's the third time he's won the award in this field.   — Yes. He ________ his maximum potential in the past decade.

  A.explored

  B.is exploring

  C.has been exploring

  D.has explored

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• 8The little boy ________ in the mud all morning. No wonder he is dirty from head to foot.

  A.has played

  B.is playing

  C.has been playing

  D.was playing

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• 9I_____ violin lessons every two weeks, but I think I'll make it every week from next month.

  A.am having

  B.have had

  C.have

  D.have been having

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• 10Excuse me, Marcia, a reporter from Vanity Fair     all day. Could you speak to her now?

  A.phones

  B.has phoned

  C.has been phoning

  D.phoned

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