单项选择题

He is hopeful about his chances of winning a gold medal in the Olympics next year.

A. optimistic
B. optional
C. outstanding
D. obvious
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单项选择题
My father has been on the salary schedule in this factory for nearly 20 years.
A. pay packet
B. payoff
C. payroll
D. payment
单项选择题
It is well-known that the retired workers in our country are eligible to free medical care.
A. entitled to
B. involved in
C. associated with
D. assigned to
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