单项选择题

Since we can’t hear you at the back of the hall, you’ll have to ______ your voice.

A. improve
B. increase
C. raise
D. open
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单项选择题
Some say yes and others say no; I don’t know ______ to follow.
A. whether
B. what
C. whom
D. how
填空题
We have to find new ways to (short) ______ the process of production.
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