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    concentrate on　so as to　depend on　look forward to　defend...?against?　accuse...of?

    1.We should　　　 our country 　　　 invasion.?

    2.The police 　　 John 　　　 murder.?

    3.It's too noisy outside.I can hardly　　 my work.?

    4.My little cousin is　　 his birthday presents.?

    5.Mail your package early　　 ensure its timely arrival.?

    6.It's not necessary for children to 　　 their parents all the time.?

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    We need concentrate all our efforts ________what we are doing.
    A．on　　 B．in
    C．with　 D．to

     

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     I can concentrate     my homework with noise going on.

       A. of      B. on      C. in      D. at

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    You should concentrate your efforts on passing the exams．(翻译)

    ________________________

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    We should concentrate all our efforts on improving education．

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