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        The earth is our home．We must take care of it．Life today is easier than it was  1  years ago，but it has brought some new problems．One of the biggest problems is pollution．We can see it，smell it，drink it and even hear it．

       Man has polluted the  2  ．the more people，the more pollution．Many years ago，the problem was not so serious because there were not so  3  people．When the land was used up or the river was not clean in a place，man went to  4  place．Now man is slowly polluting the whole world．

    5   pollution is still the most serious，it’s bad for  6  things in the world．

    1．A．hundred                 B．hundreds of          C．hundred of

    2．A．moon                    B．star                     C．earth

    3．A．lot                         B．little                     C．many

    4．A．others                   B．the other              C．another

    5．A．Air                        B．Water                  C．Noise

    6．A．life                        B．live                      C．living

    BCCCAC

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