单项选择题

（）you return those books you have borrowed to the library immediately you will have to pay a fine.

A．Until
B．Provided
C．If
D．Unless

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单项选择题
After（）for the job, as usual, you will be required to take a language test.

A．interviewing
B．interviewed
C．being interviewed
D．having interviewed
单项选择题
He said that he would write to us but so far we（）from him.

A．didn't hear
B．haven't heard
C．should not hear
D．hadn't heard.
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