单项选择题

--You've done this before, right
--No, but if we follow the directions, we () have any trouble.

A．needn't
B．mustn't
C．shouldn't
D．couldn't

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单项选择题

You should keep the milk in the ice box, () it will go bad.

A．so
B．but
C．and
D．or

单项选择题

In order to keep fit, you can get off the bus one or two stops () and walk the rest of the way.

A．early
B．earlier
C．more early
D．the earliest

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