单项选择题

Mark offered to help me to learn English ______.

A．on duty
B．in vain
C．on purpose
D．in earnest
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单项选择题
Every autumn the bears can be seen ______ around this town of about 800 people.
A．wondering
B．wandering
C．winding
D．wounding
单项选择题
It is well admitted that the high ______ rate is caused in part by failure to communicate.
A．unemployment
B．birth
C．divorce
D．inflation
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