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
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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
填空题
______(油漆成) red, the building stands out among the rest and looks very attractive. (paint)
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