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20. Everyone is busy working. You can’t stay here     you keep quiet.

    A. if                  B. when            C. once             D. unless

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19. This is the only one of the books     we need.

    A. that             B. which            C. what             D. all

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18. Things are     on the moon     on the earth.

    A. as heavy; as                         B. not so light; as

C. heavier; than                         D. much lighter; than

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17. The police     the man to see if he had a gun.

    A. searched          B. looked for         C. found out         D. searched for

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16. Many satellites have been sent     into space.

    A. for              B. out              C. off              D. up

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15. The fire was getting stronger and stronger and it seemed to    .

    A. lose control           B. be under control     C. be out of control        D. be controlled

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14. There are too many people in the house. There isn’t enough     for us all.

    A. rooms            B. space            C. floor             D. ground

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13. Let’s do listening     first. Listen carefully, please.

    A. practicing         B. practice           C. example          D. work

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12. There are     people     the street.

    A. too much; on       B. too much; in       C. too many; in       D. too many; at

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11. Could you tell me what you have     mind? I think I can give you some advice     it.

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

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