单项选择题

The magician picked several persons ______ from the audience and asked them to help him with the performance.

A．by accident
B．on occasion
C．at random
D．on an average
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单项选择题
The company had huge debts and was on the ______ of collapse.
A．brink
B．blaze
C．braise
D．blink
单项选择题
It is implied about Trevor Baylis that ______.
A．he invented the clockwork radio
B．he runs a race
C．he was once a singer
D．he is in charge of a swimming pool
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