单项选择题

When animals are fleeing in panic they have the greatest need to "follow the flag" of their own species, keeping the ______ together.

A. swarm
B. group
C. team
D. herd
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单项选择题
The court was told the house was unoccupied when the pair ______ but the police received information that a burglary was in progress.
A. broke out
B. broke through
C. broke in
D. broke down
单项选择题
The station care was still open so I decided that I ______ go in there.
A. must
B. could
C. might as well
D. should
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