—“Crash diets” make us lose weight fast and I am all into that. —But it_______better to work out.    
#62644
A
had
B
would be
C
wouldn’t have been
D
must have been
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—How much shall I pay for the telephone call? —You  _____. It's free.
#76026
A
mustn't
B
shouldn't
C
don't have to
D
can't
We _______ work very quickly.
#76098
A
don’t need
B
needn’t to
C
need not to
D
don’t need to