单项选择题

Although customers keep complaining about their poor service, they've made no ______ to make any improvement.

A．action
B．trial
C．attempt
D．progress
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单项选择题
The ______ cycle of life and death is a subject of interest to scientists and philosophers alike.
A．incompatible
B．exceeding
C．instantaneous
D．eternal
单项选择题
______ before, his first performance for the amateur dramatic group was a success.
A．Though having never acted
B．As he had never acted
C．Despite he had never acted
D．In spite of his never having acted
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