— I have got a headache.— No wonder. You ______ in front of that computer too long.

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• 1Better take a break. You ______ the Internet for more than three hours.

  A.are surfing

  B.surfed

  C.have surfed

  D.have been surfing

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• 2By the time you have completed the essential training, you _____ exposed to virtually every new feature of the course.

  A.are

  B.will have been

  C.have been

  D.will be

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• 3You _____ the results of the experiment by next day.      

  A.would have learnt

  B.have learnt

  C.will learn

  D.will have learnt

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• 4According to the Ministry of Health, by May 1, 2003, the total SARS deaths on the Chinese mainland_____to 170.

  A.has come

  B.had reached

  C.increased

  D.had climbed

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• 5By the time you arrive home, I_____, so please don't make any noise when you come in.

  A.shall have been sleeping

  B.shall have slept

  C.shall sleep

  D.shall be sleeping

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• 6— Why are you so late? I _____ for more than an hour. —  I'm terribly sorry. I overslept and missed the bus.

  A.am waiting

  B.was waiting

  C.have been waiting

  D.will be waiting

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• 7— 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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• 8I wonder if John has forgotten my number. I _____ him to call me for the past two hours.

  A.was expecting

  B.had expected

  C.have been expecting

  D.expected

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• 9Police are now searching for a woman who is reported to ____ since the flood hit the area last Friday.

  A.have been missing

  B.have got lost

  C.be missing

  D.get lost

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• 10We'd better take umbrellas-I'm sure it _____ when we arrive in London; it's always wet there at this timeof year.

  A.will rain

  B.is raining

  C.will be raining

  D.would rain

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