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
John is the most brilliant guitarist in our city, Roger ______ him closely.
[A] followed
[B] following
[C] to follow
[D] being followed
单项选择题
______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.
[A] Since
[B] When
[C] Unless
[D] While
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