单项选择题

The American society is ______ an exceedingly shaky foundation of natural resources, which is connected with the possibility of a worsening environment.

A．established on
B．affiliated to
C．originated from
D．incorporated with
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单项选择题
It really ______ to witness such an enormity can occur in the so-called civilized society.
A．pains her
B．makes her pain
C．is paining
D．is pained
单项选择题
Mike looks so sleepy in the class; he ______ up last night.
A．must stay
B．should have stayed
C．must have stayed
D．is sure to stay
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