单项选择题

If a substance is dissolved in water or heated, it may ______ a gas.

A. give into
B. give over
C. give off
D. give away
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单项选择题
In the meantime, the question facing business is whether such research is ______ the costs.
A. worth
B. worth of
C. worthy
D. worthwhile
单项选择题
America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
A. could
B. did
C. would
D. was
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