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We must plant more trees to     the water     running off.A. prevent; with B. prevent; from C. keep...

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The more trees, the beautiful  The less trees, the more beautiful  The more trees, the more beautiful  The less trees, the beautiful  
must plant; make up   will plant; look up  will be planted; come up with   must be planted; put off  
the more    the much    the fewer    the less  
should plant    should be planting    should be planted    should be plant  
it is necessary to have planted more trees   many more trees need to plant   our city needs more trees   we must plant more trees  
it is necessary to have planted more trees   many more tress need to plant   we must plant more trees   our city needs more trees  
cut down    cut up    cut off    cut out  
) it in necessary to have planted more trees   ) many more trees need to plant   ) our city needs more trees   ) we must plant more trees  
more than twenty    another twenty    the other twenty    less than twenty  
it is necessary to have planted many trees    many more trees need to plant    we must plant more trees    our city needs more trees  
. less; beautiful    more; more beautiful   little; beautiful    least; best  
will plant    should plant    should be planted    must plant  
in  for  ago  until  
When    Unless    Until    While  
is green    is greener    greener    to greener  
visit    join    meet    take part in  
many thousand    many thousand    many thousands of    Three thousands  
few    a lot of    a few of    a little  
more,more   much,fewer   more,fewer    more,less  
much   good   better   best