Look! The light in the room is still on. Mr. Liu          at work.
#77067
A
must
B
can’t be
C
must be
D
have to be
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Jack     his pet dog every day. The dog must feel sad when he’s alone all day long.
#75030
A
should walking
B
should to walk
C
had better walk
D
had better to walk
Do you think the plan _________ out as soon as possible?
#63589
A
should carry
B
ought to be carried
C
ought to have carried
D
ought to have been carried