Water ____ be changed into vapour but it ____ be heated to its boiling point .
#89755
A
may ; can
B
can ; must
C
may ; needn''t
D
must ; may
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It is strongly suggested that measures ________students to cheat in the exams.
#89242
A
be taken to prevent
B
be taken to forbid
C
are taken to prevent
D
are taken to forbid
－How much shall I pay for the phone call?－You __________. This is free of charge.
#89479
A
shouldn’t
B
can’t
C
needn’t
D
mustn’t
Perce Blackborow and his companions stayed on Elephant Island for six months before rescue came, so they ________ a lot of difficulties.
#87871
A
must go through
B
may go through
C
must have gone through
D
could have gone through
They didn’t attend the discussion, although they _________.
#87947
A
should
B
would have to
C
should have to
D
should have