单项选择题

You should use （）and natural language when you write a personal letter.

A．formal
B．political
C．magic
D．plain

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单项选择题
It （）commonplace to think of sport as a leisure industry now.

A．became
B．will become
C．is becoming
D．had become
单项选择题
Every plant, animal, and human being needs water to （）alive.

A．stay
B．make
C．run
D．glow
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