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21.A.boy           B.girl            C.student         D.teacher

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19.We have to be      . There is no point in looking at a house we can’t afford to buy.

    A.valuable        B.attractive       C.actual          D.practical

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18.He       have attended the concert, for he knew nothing about it.

    A.couldn’t        B.mustn’t        C.shouldn’t       D.needn’t

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17.The manager tried to explain the problem, but what he said didn’t      to the players.

    A.get about       B.get across       C.get down       D.get over

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16.-You didn’t answer me when I phoned you last night.

    -Oh, I      off a friend from England at the airport.

    A.saw           B.was seeing      C.had seen        D.have seen

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15.-Let’s stop running, I’m afraid we can’t make it.

    -But isn’t       your hope that we can get to the station in time?

    A.one           B.the one         C.there          D.it

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14.During the Olympic Games many people served as volunteers,      were young college

    students.

    A.most of whom   B.most of which   C.most of them    D.most of what

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13.The first two services are free      the third costs$3500.

    A.when          B.as            C.while          D.because

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12.The global warming, if not properly     , might lead to more natural disasters.

    A.was controlled   B.controlled       C.to control       D.being controlled

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