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
______ before, his first performance for the amateur dramatic group was a success.
A．Though having never acted
B．As he had never acted
C．Despite he had never acted
D．In spite of his never having acted
单项选择题
When traveling, it is possible that you may be advised to take the travelers' checks, which provide a secure ______ to carrying your money in cash.
A．selection
B．preference
C．alternative
D．substitute
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