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
I've got a very ______ schedule today so I can't see you until tomorrow.
A．serious
B．big
C．tough
D．tight
单项选择题
The next train ______ the station at 11 o'clock.
A．leaves
B．has left
C．left
D．leaving
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