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g on.
A．whom
B．to keep
C．informed
D．how
11.(Such ) crimes (may be) (too) complex (that) months or years go by before anyone discovers them.
A．Such
B．may be
C．too
D．that
ought (to) (stopping) work; She (has a headache )because she has been reading (too) long.
A．to
B．stopping
C．has a headache
D．too
regret (to spend) (so) much money (on) a car (that) I hardly drive in everyday life.
A．to spend
B．so
C．on
D．that
growth (of) part-time and flexible working patterns (allow) more women (to) (take) advantage of employment opportunities.
A．of
B．allow
C．to
D．take
15.(That) the sun (but) not the earth (is) the center of our planetary system (was) a difficult concept to grasp in the Middle Ages.
A．That
B．but
C．is
D．was
new instrument is (far) superior (than) the old (one) we bought three years (ago).
A．far
B．than
C．one
D．ago
17.(Though) some people have suggested that women (would return to) housework (in order to) leave more jobs for men, but the idea has been rejected (by) both women and men in public polls.
A．Though
B．would return to
C．in order to
D．by
extent (of) the harmful effect was of locoweeds (on) animals (depends) on the soil (that) the plants grow.
A．of
B．on
C．depends
D．that
19.(After) a (th