单项选择题

Business letters must always be _____, but we should write in a natural way to friends.

A． formal
B．normal
C．former
D．casual
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单项选择题
Only when we live in _______ with nature can we make the most out of it.
A．cooperation
B．interaction
C．integration
D．harmony
单项选择题
The job required that _______ at 7 o'clock every morning.
A．he will be at the factory
B．he be at the factory
C．he was at the factory
D．he has been at the factory
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