单项选择题

Once you have started a job, you should do it______.

A．in practice
B．in theory
C．in earnest
D．in a hurry
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单项选择题
Although the new library service has been very successful, its future is______certain.
A．at any rate
B．by no means
C．by all means
D．at any cost
单项选择题
These two chemicals______with each other at a certain temperature to produce a substance which could cause an explosion.

A．interact
B．attract
C．react
D．expel
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