单项选择题

I usually go back home by bus. It's much （）than going by train

A．cheap
B．cheaper
C．cheapest

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单项选择题
Don't worry. Our friends will come to help （）

A．ourselves
B．ours
C．us
单项选择题
You should （）playing computer games. It's bad for your eyes.

A．keep up
B．give up
C．look up
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