单项选择题

We must __________ using plastic bags in order to protect our earth.

A．give away
B．give in
C．give out
D．give up
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单项选择题
Don’t __________too late, or you will feel tired in class.
A．wake up
B．stay up
C．get up
D．stand up
单项选择题
Our life has but a short__________
A．duration
B．span
C．episode
D．range
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