单项选择题

Most environmental problems exist because adequate measures for preventing them _________ taken in the past.

A．was not
B．were not
C．were not being
D．being not
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单项选择题
Did Amy's parents leave her any money No, she has to support _________ now.
A．by herself
B．herself
C．all alone
D．on her own
单项选择题
The Russians also burned their farms and _________ their dams and power plants.
A．blew up
B．blew off
C．blew out
D．blew over
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