In the past decades, sea ice ____ in the Arctic as a result of global warming.

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• 1— Sir, I'm here. — Please listen. I _____ asking your parents to come to our school, but I'd like to hear your opinion first.

  A.have considered

  B.am going to consider

  C.considered

  D.have been considering

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• 2They   ____ on this project for l 4 hours, but it’s so difficult to persuade them to have a rest.    

  A.had worked

  B.have been working

  C.worked

  D.are working

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• 3—Hi, which university do you prefer?—Well, I've been considering _____ to Harvard University.

  A.to go

  B.going

  C.gone

  D.being going

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• 4-Hi，Tracy，you look tired.-I________the living room for three hours.

  A.paint

  B.had painted

  C.was painting

  D.have been painting

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• 5Look at the sweat on her face.She________the house since she got up this morning.

  A.is cleaning

  B.has been cleaned

  C.was cleaning

  D.has been cleaning

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• 6We _____ on our project day and night in the past two weeks.[      ]

  A.had worked

  B.have been working

  C.will be working

  D.are working

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• 7I won't tell the student the answer to the math problem until he____on it for more than an hour.   [      ]

  A.has been working

  B.will have worked

  C.will have been working

  D.had worked

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• 8-You don't have to play that record so loud,do you?-I'm sorry. __ you?

  A.Has it been bothering

  B.Did it bother

  C.Will it bother

  D.Had it bothered

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• 9________ in a space suit in the base, the young man looks more like an astronaut I've been ________.

  A.Dressed; admiring

  B.Dressed; admired

  C.Wearing; admiring

  D.Worn; admired

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• 10—Waiter,  what about my food?I________for over 30  minutes.—Oh,  sorry,  sir.Just one more minute,  please.

  A.have waited

  B.was waiting

  C.have been waiting

  D.had waited

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