一道英语完形填空题,

一道英语完形填空题,
How much sleep do you need?We are all different.Some people need only three hour's sleep a night,__1__ need ten hours of sleep a night.After age fifty,the average sleep time goes __2__ to 6.5 hours a night.
Most of people have a night when they can't sleep.About one in three Americans has a problem with __3__.Many of these people __4__ fall asleep.
This is not __5__ problem.Many famous people __6__ could not fall asleep.Some of these people had their own ideas to make themselves sleep.Benjamin Franklin,the famous statesman and inventor had four __7__.He __8__ from one to another to fall asleep.King Louis XIV(路易十四）of France had 413 beds and had to fall __9__ in one of them.Mark twain,the famous __10__ writer,had a different way.He lay on his side across the end of the bed.
1.A.another B.the other C.others D.the others
2.A.up B.out C.in D.down
3.A.work B.sleep C.their bed D.their health
4.A.can not B.can C.easily D.want to
5.A.an old B.a new C.the only D.a different
6.A.in America B.in France C.in history D.nowadays
7.A.beds B.houses C.ways D.ideas
8.A.wanted B.lay C.moved D.went on
9.A.sleep B.asleep C.sleeping D.sleepy
10.A.American B.Australian C.Canadian D.Chinese
请说明第3,5题的原因,第三我选D,因为睡觉睡不着是健康中的一个问题啊!