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
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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
单项选择题
(How and why) this language (has) survived for more than a thousand years, while (spoke) by very few, is hard (to explain).
A．How and why
B．has
C．spoke
D．to explain
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