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30.Could you help Danny __________________his invention?

    A.make         B.made         C.makes         D.making

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29.No one knows last night.

    A.what happening                B.what happened

    C.what did happen               D.happened what

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28.It _____________the inventor a long time to invent this type of engine.

    A.taked         B.take          C.took             D.will took

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27.The teacher won't be angry, _______________Tom comes to school on time.

     A.when         B.as long as       C.until          D.but

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26.It is good for _______________to ___________more vegetables.

    A.we;eat       B.us;eating       C.us;eat        D.we;eating

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25. -There ______________many animals on the island.

   -You are right.

    A.maybe        B.maybe have       C.may have       D.may be

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24.We should try our best to keep our classroom____________________________.

    A.cleaned        B.clean         C.cleaning        D.to clean

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23.We must plant more trees to stop the sand from ________________towards the rich farmland.

     A.move         B.to move        C.moved         D.moving

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22.Danny won' t present his invention until __________he it.

    A.will finish       B.finishes        C.finish          D.won' t finish

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21.-I will go to Qingdao for a visit with my family this summer holiday.

     A.So do I        B.So I do        C.So will I        D.So I will

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