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
Every member of the original cast was signed ______ her.
A．in addition to
B．except
C．except for
D．besides
单项选择题
I understand ______ preparation that the staff must put in under pressure to meet the deadline.
A．more than the enormous amount of
B．better than most the enormous number of
C．better than most the enormous amount of
D．fewer than the number of
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