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We should return the books to the library________ timE.

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return  should return  be returned  would be returned  
return    should return    be returned    would be returned  
that    which    how    whether  
how long can I keep the books  how long I can keep the books   when should I return the books  when I should return the books  
mustn’t, should    should, mustn’t    can’t, can    should, can  
return  should return   be returned  would be returned  
lost    suggested    returned    borrowed  
took; borrowed    borrowed; have borrowed   borrowed; have had   borrowed; had  
though    when    unless    because  
that  when  which  where  
sense    architect    soul    librarian  
when    as    whose    what  
how long can I keep the books    how long I can keep the books    when should I return the books    when I should return the books