Materials of this kind ____ once ____ on the wall.

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• 1The research they had been devoted to ______ to be of great value to the cancer patients
  A.is proved
  B.proves
  C.has proved
  D.proved
   
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• 2I feel so excited! At this time tomorrow morning I______to Shanghai.
  A.will be flying
  B.will fly
  C.have been flying
  D.have flown
   
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• 3To my disappointment, the TV set I had ____ was out of order again. It’s a waste of money.
  A.repaired
  B.repaired it
  C.had repaired it
  D.had repaired
   
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• 4Stay awake! You should know that it ________ to sleep in class.
  A.doesn’t permit
  B.is not permitted
  C.will not be permitted
  D.was not permitted
   
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• 5Excuse me. I_________I was blocking your way
  A.didn’t realize
  B.don’t realize
  C.haven’t realized
  D.wasn’t realizing
   
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• 6By the end of last year, we _________seven hundred English words.
  A.learned
  B.have learned
  C.had learned
  D.would have learned
   
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• 7Dear me! Just _________ at the time! I _________ no idea it was so late.
  A.look
  B.have
  C.looking
  D.had
  E.look
  F.had
  G.looking
  H. have
   
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• 8Up till now, more than 120 world-famous enterprises ______ companies in Tianjin Binhai New Area.
  A.have established
  B.established
  C.will establish
  D.have been established
   
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• 9They started off at about 5 o’clock in the morning . They should______there by now.
  A.arrive
  B.have been arriving
  C.have arrived
  D.be arriving
   
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• 10I was out of town at the time, so I don’t know exactly how it _______.
  A.was happening
  B.happened
  C.happens
  D.has happened
  
   
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