单项选择题

When first ______ to the market, the toys didn't attract much attention.

A．introducing
B．introduced
C．was introduced
D．being introduced
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单项选择题
It is to be ______ that your health is ______ since you've been working such long hours.
A．expecting; suffering
B．expecting; suffered
C．expected; suffering
D．expected; suffered
单项选择题
The hero of the story was an artist ______.
A．in his thirty
B．in his thirty's
C．in his thirtieth
D．in his thirties
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