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    We are wondering ________ we can prevent people from polluting the earth.
    A．whoB．thatC．whetherD．what

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    _______ provides many hours of air for astronauts in space.
    A．An air tankB．A power packC．A helmetD．A space sleeping bag

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    After half a day’s hard work, we made our classroom look as _______ as new.
    A．wellB．betterC．bestD．good

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    Computers have made a great difference _______ our everyday life.
    A．withB．ofC．toD．for

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    Mr Chen __________ his mobile phone to the shop because it can’t work at all.
    A．need to returnB．needs returnC．need returningD．needs to return

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    —__________ do I have to change the robot’s batteries? —Every two months.
    A．How longB．How soonC．How oftenD．How many

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    The Nanjing Yangtze River Bridge is still very strong, ___________ it is almost 43 years old.
    A．althoughB．butC．soD．because

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    On the night of February 14th, 2011, all the Chinese _________ by Guo Mingyi, a very common worker who ________ more than 180 poor children since 1994.
    A．are moved, helpsB．moved, helped
    C．were moved, has helpedD．moved, have been helped

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    ________ made kung fu popular in the west. He is my hero.
    A．Christopher ColumbusB．Bruce LeeC．PeléD．Elvis Presley

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    All the children like the teachers ________ can understand them.
    A．whatB．whichC．whoD．whose

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