单项选择题

Water is an essential global resource and it is up to each of us to ______ it.

A．preserve
B．maintain
C．reserve
D．conserve
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单项选择题
How I wish you ______ her everything! She almost cried her heart out.
A．did not tell
B．had not told
C．were not telling
D．are not telling
单项选择题
Divorce should not be the only solution. You may work ______ your personal differences and similarities first.
A．out
B．in
C．off
D．on
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