单项选择题

Most of suicide victims are（）

A．middle-aged males
B．men from age 40 to the mid-60s
C．blue collar workers
D．white collar workers

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I have no doubt（）he will get through the examination.

A．whether
B．as
C．that
D．if
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（）you return those books you have borrowed to the library immediately you will have to pay a fine

A．Until
B．Provided
C．If
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