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It's a good habit to wash your hands ________ you have meals.

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unless  while  when  before  
I think so    Have a good time    Of course   I.’m afraid not  
if  when  as soon as   the same as  
taste    smell    wash    plant  
may    can    have to    must  
Excuse me  All right   No  Good idea  
a; /    a: a    the; a    /; a  
good   bad   well   wonderful  
unless    while    when    before  
good    bad    well    wonderful  
may    can    have to    must  
it    its    they    them  
a;/   a;a   the;a   /;a  

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