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People have realized the     (important) of the air pollution.

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have I realized  I have realized  did I realized  I realized  
that    /    which    whether  
than    that    which    what  
have realized  has realized  have been realized  has been realized  
have realized    has realized    have been realized    has been realized  
have realized   has realized   have been realized   has been realized  
whose  where  which  that  
was done    will be done    to be done    is done  
people have    people had    were people    have people  
had realized; wouldn’t be    realized; wouldn’t be    had realized; wouldn’t have been    realized; wouldn’t have been  
watched  observed   witnessed  realized  
is done    was done    will be done    to be done  
was done  will be done  to be done  is done  
stretches    spreads   extends    expands  
have realized    has realized    have been realized    has been realized  
a; /    the; an    the; the    /; an  
is done  will be done  to be done  was done  
a; /  the; an   the; the  /; an  

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