单项选择题

Mary (must be) over 30 (now); it's (about) time she (should get married).

A．must be
B．now
C．about
D．should get married
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单项选择题
Approximately (three - fourths) of (the earth's) surface (are) covered (with) water.
A．three-fourths
B．the earth’s
C．are
D．with
单项选择题
There (are) not many people in this city (which) (own) the houses they (live in).
A．are
B．which
C．own
D．live in
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