单项选择题

A long time ago, at a national conference on biology, he cautiously ______ his new theory on life.

A．advanced
B．relieved
C．produced
D．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
He kept a ______ hold on her hand as he helped her over the fence.
A．solid
B．stiff
C．firm
D．rigid
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