单项选择题

We（）our voice depending on the circumstances, particularly in relationship to background noise.

A. improve
B. modulate
C. rectify
D. temper

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单项选择题
I was embarrassed when the （） test paper my teacher spoke about turned out to be mine. I had forgotten to put my name on it.

A. marked
B. branded
C. anonymous
D. fictitious
单项选择题
He used to （）his parents to help with the expenses.

A. count on
B. take in
C. look into
D. get over
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