单项选择题

There are eight tips in Dr. Roger's lecture on sleep, and one of them is: ______ to bed early unless you think it is necessary.

A．doesn't go
B．not to go
C．not going
D．don't go
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单项选择题
I'm going to the supermarket this afternoon. Do you have anything ______
A．to be buying
B．to be bought
C．for buying
D．bought
单项选择题
The interest ______ be divided into five parts, according to the agreement made by both sides, declared the judge.
A．may
B．should
C．must
D．shall
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