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
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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
单项选择题
(Although) (both of) them are trying (to get) the scholarship, she has the (highest) grades.
A. Although
B. both of
C. to get
D. highest
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