单项选择题

Others viewed the findings with ______, noting that a cause-and-effect relationship between passive smoking and cancer remains to be shown.

A．caution
B．passion
C．optimism
D．deliberation
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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
单项选择题
A．toB．forC．withD．of
A．to
B．for
C．with
D．of
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