单项选择题

While doing calculation for the project, the designers ________ a new solution to a geological problem.

A．fell into
B．stumbled upon
C．set out
D．discovered

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单项选择题

According to the acoustics, continual exposure ________ noise of high intensity would lead to loss of hearing.

A．of
B．with
C．to
D．by

单项选择题

You'd better let me know as soon as there is a(n) ________ position in the branch office.

A．empty
B．vacuum
C．hollow
D．vacant

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