单项选择题

______ , follow the directions on the bottle carefully.

A．When taken drugs
B．When drugs are taken
C．When one takes drugs
D．When taking drugs
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单项选择题
Williamsburg has now been restored so that it looks as it ______ during the 18th century.
A．could
B．would
C．was
D．did
单项选择题
A long time ago, at
A．a .national conference on biology, he cautiously ______ his new theory on life.A. advancedB. relievedC. producedD. thrust
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