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There is     sign on the wall in the students' reading room.     sign means you can't talk loudly h...

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must    mustn’t    need    needn’t  
PARKED    SMOKE    SPITTING    SMOKED  
to smoke    smoke    smoking    smoked  
in the wall    on the wall    of the wall    at the wall  
doesn’t allow  isn’t allowed  is allowed  allows  
will    may    shall    must  
the longest wall runs    runs the longest wall    does run the longest wall    does the longest wall run  
wrote  covered  read  expressed  
Of course not    Never mind    Yes, please    You’d better not  
should    must    shouldn’t    can