单项选择题

(For) married mothers, the time (spend) on child care (increased) to (an average) of 12.9 hours a week in 2009.

A．For
B．spend
C．increased
D．an average of
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单项选择题
Many parents feel they (need to) keep a closer eye (to) their children (because) of concerns (about) crime and school violence.
A．need to
B．to
C．because
D．about
单项选择题
(Nearly) half of Americans (aged) 25 and (old) take part in some (form) of continuing education.
A．Nearly
B．aged
C．old
D．form
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