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It is vital that we _____ act out at once to protect the environment.

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a; /  /; a  the; /  /; the  
to be done, act   are done, should act    were done, acted    being done, would act  
being done, should act    to be done, act    to be done, acted    being done, would act  
even though    unless    as long as    in case  
as    which    whether    that  
which    when    where    what  
hadn’t acted  haven’t acted  don’t act  won’t act  
hadn't acted    haven't acted    won't act    don't act  
Let's not  matters of no important  vital  deal with  
hadn’t acted    haven’t acted    don’t act    won’t act  
vital important    of vital importance    of little importance    less important  
hadn’t acted  haven’t acted  don’t act  won’t act  
hadn’t acted    haven’t acted    don’t act    won’t act  
would  should  will  can  

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