问题描述：
1.I can't keep myself active during the day.
You _____ take more exercise,
a.must not b,need ,to c,must .be d.needs.
2.Please _____use Mr,Mrs,Ms or Miss before their first names.
a,mustn't b.don't c.can't d,be not.
You _____ take more exercise,
a.must not b,need ,to c,must .be d.needs.
2.Please _____use Mr,Mrs,Ms or Miss before their first names.
a,mustn't b.don't c.can't d,be not.
问题解答：
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