Professor Smith, along with his assistants,______ on the project day and night to meet the deadline.

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• 1—  Ready to quit guessing, Sandy?— No, no, I hold on! I think I______ to the answer.

  A.come

  B.have come

  C.am coming

  D.came

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• 2Email,as well as telephones,________an important part in daily communication.

  A.is playing

  B.have played

  C.are playing

  D.play

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• 3一Ready to give up guessing，Sandy? 一No，no，hold on! I think I______ at the answer now．

  A.arrive

  B.am arriving

  C.have arrived

  D.will arrive

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• 4—Ready to quit guessing, Sandy?—No, no, I hold on! I think I        to the answer.

  A.come

  B.have come

  C.came

  D.am coming

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• 5With the death of Libyan leader Muammar Gadhafi on Thursday, the country's new leaders ______ the challenge of rebuilding a war-torn nation.  

  A.faced

  B.are facing

  C.had faced

  D.is faced

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• 6Remember to save what you ________ on once in a while in case the computer suddenly crashes.

  A.work

  B.will work

  C.are working

  D.worked

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• 7Hurry! The train ________. You know it ________ at 8: 00

  A.m.. A.leaves; leaves

  B.leaves; is leaving

  C.is leaving; leaves

  D.is leaving; leaving

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• 8—Have you decided when to leave for Beijing?—Yes, I ______ the day after tomorrow.

  A.am leave

  B.have left

  C.left

  D.am leaving

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• 9If a computer crashes, you will lose the file you ______ on if you don't save it early enough.  

  A.work

  B.are working

  C.will work

  D.worked

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• 10They ____ on the program for almost one week before I joined them,and now we ____ on it but no good results have come out so far.    

  A.had been working; are still working

  B.had worked;were still working

  C.have been working;have worked

  D.have worked; are still working

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