完形填空。 How much sleep do we need? We are all different. Some people need only three hours of sleep a night. 1 need ten hours of sleep a night. After age fifty, the average (平均) 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 sleep. This is not 5 _ problem. Many famous people 6 could not fall asleep. Some of these people had their own ways to make them sleep. Benjamin Franklin, the famous statesman and inventor had four 7 . He 8 from one to the other to fall asleep. King Lois XIV of France has 413 beds and hoped _ 9 _ asleep in one of them Mark Twain, the famous American writer, had a different way. He lay 10 _ his side across the end of the bed! ( ) 1. A.Another ( ) 2. A.up ( ) 3. A.work ( ) 4. A.can not ( ) 5. A.an old ( ) 6. A.in America ( ) 7. A.beds ( ) 8. A.went ( ) 9. A.to fall ( ) 10.A.in B.The other B.out B.sleep B.can B.a new B.in France B.houses B.lay B.fall B.of C.Others C.in C.their health C.easily C.the only C.in history C.ways C.wenton C.falls C.on D.The others D.down D.their beds D.want to D.a difficult D.nowadays D.ideas D.moved D.falling D.to