单项选择题

David ______ his company's success to the unity of all the staff and their persevering hard work.

A．attributed
B．contributed
C．acknowledged
D．pledged
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单项选择题
Not only ______ us light, but also it gives us heat
A．the sun gives
B．the sun does give
C．gives the sun
D．does the sun give
单项选择题
I arrive at nine o'clock, teach until twelve thirty and then have a meal; that is my morning ______ .
A．habit
B．custom
C．practice
D．routine
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