if we sleep for only five or six hours a night.we will be___

if we sleep for only five or six hours a night.we will be___ We shouldn't sleep[ ] than eight hours a night. 1.--there days I can only sleep for four or five hours at ni we need to sleep eight or nine hours every night.为什么need后加to We should sleep at ( ) for eight hours a day 英语翻译we only sleep about three hours a day.and we sometimes s I____(sleep)for only 3 hours last night I slept only (for five hours) last night Usually I sleep for eight or nine hours a night.中为什么要用介词for而 How long did you sleep last night?Only five hours. （2011扬州中考 if we continue to be___ their cry for help, things are sure we A(have been working) B(for) nearly five hours,c(let's) st