单项选择题

A teacher ______ do every exercise but a student ______.

A．may not ; must
B．needn't; must
C．can't; should
D．mustn't; should
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单项选择题
We couldn't eat in a restaurant because ______ of us had ______ money on us.
A．all ; no
B．any ; no
C．none ; any
D．no one ; any
单项选择题
It is a small country, yet has a lot of ______ resources.
A．potential
B．unknown
C．secret
D．unlimited
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