单项选择题

When there was a short ________in the conversation, I asked if anyone would like anything to drink.

A．blank
B．space
C．pause
D．wait
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单项选择题
Many people nowadays save money to ______for their old age.
A．cater
B．supply
C．provide
D．equip
单项选择题
--Must I turn the paper in at the end of this week--No, you ______.
A．mustn’’t
B．needn’’t
C．don’’t
D．shouldn’’t
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