单项选择题

We have to work even harder though we feel quite ______ our success.

A．secure of
B．nervous about
C．worried about
D．competent for
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单项选择题
The government has strictly carried out the policy of birth control, thus resulting in the ______ of the population in our city.
A．turning down
B．dropping out
C．leveling off
D．holding up
单项选择题
I regretted ______the expensive air-conditioner.
A．not to afford
B．not affording
C．not being able to afford
D．I can't afford
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