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21.A. while          B. as                     C. when              D. until

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19.He left without a word as if     .

    A. never to return                            B. never returning

    C. he had never returned                      D. he would never returning

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18.-What do you know about the new plan?  

   - I know every detail about it.    , I know it.

   A. Therefore           B. Or rather           C. Nameiy               D. That is

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17.We decided not to climb the mountains because it was raining     .

    A. badly               B. hardly              C. strongly               D. heavily

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16.-He failed again.

  -The     of too much time to computer games leaves too little time for studying.

  A. use                 B. cost               C. devotion              D. expense   

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15.I don’t understand how you got a ticket. I always      you     a careful driver.

A. think; are            B. am thinking        C. thought; were         D. think; were

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14.It’s often less expensive to buy goods in     quantity, but you’d better examine     quality before buying them.

   A. / ; the              B. the; /       C. a; the        D. the; the

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13.They can’t be quarrelling now,     they?

                          A. can                B. may       C. are      D. will

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12.-     one and a half days enough for the painting to be finished?

   -I don’t think it’s enough and only after     go on with it.

A. can                 B. may               C. are                   D. will

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