单项选择题

I don't think physics (is) hard (to learn). (However), my physics (are) very poor.

A．is
B．to learn
C．However
D．are
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单项选择题
Running slowly for (some) three miles every day (is proved) a good (form) of (exercise).
A．some
B．is proved
C．form
D．exercise
单项选择题
ff you don't put the milk in the refrigerator, it may ________
A．go by
B．go off
C．go on
D．go back
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