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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I've got a very ______ schedule today so I can't see you until tomorrow.
A．serious
B．big
C．tough
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His parents died when he was young so he was ______ by his aunt.
A．bred
B．fed up
C．brought up
D．grown up
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