还原句子
In China ,more and more middle school students are getting shorter sleeping time than before. ________  because they have much homework to do. Some homework is given by their teachers and some by their parents. Also________. They are not careful enough while they do their homework, _______. Some students spend too much time watching TV or playing computer games. They stay up very late. Some student have to get up early every morning on weekdays to get to school on time by bus or by bike. ________.
Schools and parents should cut down some of the homework so that children can enjoy more than nine hours of sleep every night for their health. For children, we should make best use of our time. ________, we will find it much better for both our study and health.