单项选择题

To ______ the world peace has been one of the most crucial functions of the United Nations since it was founded in 1945.

A．sustain
B．maintain
C．contain
D．retain
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单项选择题
I'm not sure whether I can gain any profit from the investment, so I can't make a (an) ______ promise to help you.
A．accurate
B．defined
C．definite
D．sure
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