(    )14. There is a lot of research_how    languages    are    learned.

A. with    B. about    C. on    D.    in

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(    )19. The classroom_by the students every day.

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25. It’s raining very heavily.(改寫為感嘆句）

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Many scientists say that the world is getting hotter and hotter. If they are right, the ice at the North and South Pole will melt eventually. If this 26    , the sea will rise and

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We know that the sun 29 the earth. The heat from the sun hits the 30 , and some of it goes 31 into the sky. However, factories and cars 32 a lot of carbon dioxide(二氧化碳）. When the gas rises into the sky，the heat from the sun can come 33 them but the heat from the ground cannot. It 34 near us in the sky and makes the 35 hotter and hotter every year.

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(    )26.    A.    happens    B.    falls    C.    changes    D.    shows

(    )27.    A.    of    B.    or    C.    but    D.    and

(    )28.    A.    higher    B.    larger    C.    safer    D.    farther

(    )29.    A.    looks    B.    covers    C.    circles    D.    heats

(    )30.    A.    ground    B.    space    C.    forest    D.    plants

(    )31.    A.    out    B.    back    C.    off    D.    of

(    )32.    A.    make    B.    process    C.    produce    D.    form

(    )33.    A.    through    B.    over    C.    into    D.    toward

(    )34.    A.    hides    B.    continuevS    C.    follows    D.    stays

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(    )36.    A.    building    B.    flat    C.    tool    D.    machine

(    )37.    A.    putting    B.    storing    C.    guarding    D.    growing

(    )38.    A.    excited    B.    disappointed C. worried    D.    pleased

(    )39.    A.    dangerous    B.    harmful    C.    heavy    D.    useful

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(    )20. This kind of metal is used_making    planes.

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