单项选择题

It is on (each) individual effort (which) the safety and happiness of (the whole) (depend).

A．each
B．which
C．the whole
D．depend
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单项选择题
(The seventeenth) century was one (which) many significant (advances) (were made) in both science and philosophy.
A．The seventeenth
B．which
C．advances
D．were made
单项选择题
You must (follow) the directions (exactly), and if you become (confusing), you must take the time (to go) back and read them over.
A．follow
B．exactly
C．confusing
D．to go
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