单项选择题

Doctors say that exercise is important for health, but it ______ be regular exercise.

A．can
B．will
C．must
D．may
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单项选择题
Not until he left his home ______ to know how important the family was for him.
A．did he begin
B．had he begun
C．he began
D．he had begun
单项选择题
Galileo lived in the City of Pisa, ______there is a leaning tower about 180 feet______.
A．in which ; height
B．where ; in height
C．which ; high
D．where ; height
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