单项选择题

We can accept your order ______ payment is made in advance.

A．in order that
B．on condition that
C．on the excuse that
D．in the belief that
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单项选择题
Techniques for ______ sleep would involve learning to control both mind and body so that sleep can occur.
A．pushing
B．cultivating
C．promoting
D．strengthening
单项选择题
According to the periodic table, ______ still some elements undiscovered.
A．there seem to be
B．it seems to be
C．it seems that
D．here seem
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