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
After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.
A．abortive
B．difficult
C．experimental
D．preliminary
单项选择题
As I recall my plane trip around the world last July and August, I think my difficulty was the adjustment to the different ______ served with the food in the various cities we visited.
A．seasonings
B．qualities
C．grades
D．ingedients
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