单项选择题

You must be careful ______.

A．in future
B．in the future
C．after future
D．on the future
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单项选择题
Scientists say it may be five or ten years ______ it is possible to test this medicine on human patients.
A．since
B．before
C．after
D．when
单项选择题
When there are small children around, it is necessary to put bottles of pills out of ______.
A．reach
B．hand
C．hold
D．place
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