单项选择题

It's important for us to ______ our forest resources.

A．conserve
B．reserve
C．prevent
D．store
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单项选择题
I'm going to the theatre tonight. So ______ .
A．shall I
B．am I
C．do I
D．I am
单项选择题
______ ，I would take his advice.
A．Had I been you
B．Were I you
C．Be I you
D．Should I were you
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