单项选择题

The little boy had no choice but to look on ______ as his mother was seriously injured in the traffic accident.

A．help
B．helpless
C．helpness
D．helplessly
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单项选择题
Market research is usually very ______, involving thousands of people answering hundreds of questions.
A．detailed
B．details
C．detail
D．detailing
单项选择题
I was too ______ to say hello to my drunken father in the street.
A．embarrassed
B．embarrass
C．embarrassing
D．embarrassment
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