单项选择题

Three weeks after the suicidal bombing, the police were still hunting for bombers for they believe more were ______.

A．on the verge
B．on the sly
C．on the spot
D．on the loose
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单项选择题
The theory of the origin of the universe is just ______ and lacks proof.
A．spontaneous
B．hypothetical
C．intuitive
D．empirical
单项选择题
Dried vegetables are easy to use if you remember to ______ them overnight.
A．plunge
B．soak
C．put
D．immerse
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