单项选择题

A long time ago, at

A．a .national conference on biology, he cautiously ______ his new theory on life.A. advancedB. relievedC. producedD. thrust
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单项选择题
In the effort to fire a Civil Service employee, his or her manager may have to' spend up ______ $100, 000 of tax money to do so.
A．till
B．to
C．for
D．about
单项选择题
Mary is as vain as peacock and always wants to be the ______ of attention.
A．sight
B．emphasis
C．focus
D．object
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