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31.It was not until 1920 ______ regular radio broadcasts began.

    A.while          B.which         C.that           D.since

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30._______ you diet and take more exercise ______ be able to keep fit.

    A.Only if , you will                 B.Only if, will you 

C.Unless, will you                  D.Unless, you will

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29.As nobody here knows what is wrong with the machine, we must send for an engineer to _____ the problem.

    A.handle         B.raise           C.face           D.present

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28.My brother was so _______ reading the novel that she didn’t realize the food had got bad.

    A.absorbing       B.absorbing in     C.absorbed in      D.absorbed to

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27.---The lights were left on all night long.

  ---Yes.It seems that Tom is ______.He was the last one who left the classroom yesterday evening.

    A.blaming        B.blamed         C.to be blamed     D.to blame

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26.______ her nose, Mary is a beautiful girl.

    A.Besides        B.Apart from      C.Except that      D.Now that

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25.The band around the corner was robbed last night.The police are now ______ the matter.

    A.looking after     B.looking for      C.looking into     D.looking out

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24.The professor told us that his conclusion was based ______ his further research about that then.

    A.on            B.about          C.for            D.above

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23.______ delighted me most was ______ my daughter was admitted to Beijing University.

    A.That, what      B.What, that      C.What, what     D.That, that

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22.Finding her car stolen, _________.

    A.a policeman was asked to help

  B.the area was searched thoroughly

    C.it was looked for everywhere

  D.she hurried to a policeman for help

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