1.I can't keep myself active during the day.
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.
答
B(need to do sth需要做某事,need在这是实意动词)
B（祈使句）