单项选择题

Walking is believed to be one of the best ways for a person to ______ healthy.

A．reserve
B．preserve
C．stay
D．maintain
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单项选择题
A panda's primary activity is sleep, ______ its waking hours looking for food.
A．for spending
B．that it spends
C．will spend
D．and it spends
单项选择题
I'm by no means against your decision, but I should make it clear that I'm not going to be ______ to it.
A．bound
B．stuck
C．fastened
D．connected
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