单项选择题

The policeman is investigating the ______ about the traffic accident.

A. passer-by
B. passers-by
C. passer-bys
D. passers-bys
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单项选择题
We must take part in physical labor in order to ______ ourselves more closely with the working people.
A. identify
B. incorporate
C. involve
D. combine
单项选择题
In the present .economic ______ we can safely invest our money into the stock and bond .market.
A. air
B. mood
C. condition
D. climate
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