单项选择题

Take your vaccination certificate with you ______ they ask for it at the airport.

A．unless
B．in case
C．when
D．because of
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单项选择题
I saw______man going into the office．I don't know who ______ man was．
A．-/the
B．the/a
C．a/the
D．a/a
单项选择题
You mustn't mind ______ trouble over the cooking if you want your guests to enjoy their meal.
A．take
B．to take
C．taking
D．taken
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