--- How much shall I pay for the phone call? --- You ________. This is free of charge. 
#87096
A
shouldn’t
B
can’t
C
don’t have to
D
mustn’t
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All the doctors in the hospital insisted that he________ badly wounded and that he ______at once.
#87457
A
should be, be operated on
B
were, must be operated on
C
was, should be operated
D
was ,be operated on
 We      the postcards yesterday, but it didn’t arrive.
#87363
A
should receive
B
ought to receive
C
ought to have received
D
must have received