单项选择题

He worked ______ at his task for weeks before he felt satisfied that the results would justify his long effort.

A．occasionally
B．regularly
C．patiently
D．assiduously
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单项选择题
He became quite overbearing and domineering once he had become accustomed to the shown to soldiers by the natives. He enjoyed his new sense of power.
A．ability
B．domesticity
C．deference
D．insolence
单项选择题
After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.
A．abortive
B．difficult
C．experimental
D．preliminary
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