单项选择题

(If) the experiment succeeds or fails, it will (provide us) with valuable (experience) which is essential to (improving) our future work.（）

A．If
B．provide us
C．experience
D．improving

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单项选择题
Leave me alone; mind your own （）

A．events
B．affairs
C．things
D．matters
单项选择题
His father mentioned (to me) that Robert (had written to) (him) re questing money (for buying) a new car.（）

A．to me
B．had written to
C．him
D. for buying
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