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
3-G takes ______ market share. In the last quarter, 20% of the sales were 3-G phones.
A．considered
B．considering
C．considerable
D．considerate
单项选择题
The irresponsible teacher knew the student was cheating but decided to look ______.
A．other way
B．the other way
C．another way
D．other ways
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