If the students who killed themselves had only been more confident, their deaths ________.
#63688
A
need have been avoided
B
must have been avoided
C
might have been avoided
D
will have been avoided
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－I’d like to help the homeless people in the earthquake. －You ________ join a volunteer group.
#74891
A
must
B
need
C
can
D
couldn’t
(2013·天津高考)No one ________ be more generous; he has a heart of gold.
#62379
A
could
B
must
C
dare
D
need
If you _____ smoke, please go outside because this is a non-smoking office.
#63602
A
must
B
should
C
can
D
may