My careless friend Bob received a ticket for speeding. He ____ have driven so fast.
#87755
A
can’t
B
wouldn’t
C
mustn’t   
D
shouldn’t
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We _____ live in a small flat but last year we bought a house.
#88071
A
would
B
had to
C
used to
D
ought to
The doctor from Shanghai recommended that the patient ___________.
#87329
A
is not operated
B
should operate on
C
not be operated on
D
was not operated
I was so young.  You__________ better than to rely on me
#88037
A
should have known
B
should know
C
must know
D
must have known