单项选择题

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

A．by accident
B．on average
C．on occasion
D．at random
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单项选择题
She never ______ to read the news but turned at once to the crossword on the last page.
A．indulged
B．troubled
C．exerted
D．frustrated
单项选择题
Mr. Scott asked for an assistant because his work load was too ______ .
A．preoccupied
B．onerous
C．trifling
D．omnipresent
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