单项选择题

By next week the new regulations ______.

A．will introduce
B．are to introduce
C．are to be introduced
D．will have introduced
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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
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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