--- ______ you give your seat to this old man? --- Of course. 
#78168
A
Can
B
Shall
C
Need
D
Must
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Unluckily, we missed the train. we    early.
#62750
A
must have set out
B
had set out
C
should have set out
D
set out
You____Tom at the party yesterday;he went abroad for a holiday last week.
#63294
A
should have seen
B
might have seen
C
mustn’t have seen
D
couldn’t have seen