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
Your experiment reports must be checked with care before （）

A．handed them in
B．them handing in
C．being handed in
D．handing them in
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
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