Space exploration began in the 1960s, and since then about five hundred people _______ into space.

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• 1Lin Yi isn't what it used to be. The last decade ______ great changes in the city images.[      ]

  A.witnessed

  B.was witnessed

  C.has witnessed

  D.had witnessed

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• 2—Don't forget to post the letter, will you?    — I __________ it.    

  A.would post

  B.had already posted

  C.have already posted

  D.was posting

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• 3My watch ______. I have looked for it everywhere but still _________ it.

  A.haslost;havenotfound

  B.haslost;donotfind

  C.ismissing;havenotfound

  D.ismissing;donotfind

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• 4They _____ in Shanghai since 1998.

  A.live

  B.lived

  C.have lived

  D.had lived

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• 5By the time he realizes he________into a trap, it’ll be too late for him to do anything about it.

  A.walks

  B.walked

  C.has walked

  D.had walked

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• 6This is the second time I____   the Himalayas as acollege student.    

  A.climb

  B.had climbed

  C.climbed

  D.have climbed

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• 7—  Oh , it is already 9:00, but Tom is still in bed.— He ______ late last night to watch the football match. 

  A.may stay up

  B.must have stayed up

  C.could stay up

  D.should have stayed up

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• 8Jack described his father,  who____a brave boy many years ago, as a strong-willed man.    

  A.would be

  B.would have been

  C.must be

  D.must have been

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• 9— Mary,are you sure your aunt_____back from America?      — Yes. My mother_____ me. I  am going to see her now.

  A.has come; told

  B.came; had told

  C.had come; tells

  D.is coming; has told

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• 10I wasn't aware of this before, but recent research _____ that eating too much fat can contribute to heart disease.

  A.has shown

  B.will show

  C.was showing

  D.showed

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