阅读下面短文，根据短文意义，按照语法结构和行文逻辑，在空白处填入适当的单词；或根据首字母提示写出该单词。
More and more middle school students in China are getting shorter sleeping time. Most students sleep fthan nine hours every night, they have much homework to do. Some homework is by school teachers, and some by parents. Also, some students don’t know to save the time. They are not careful e while doing their homework, so it takes them a lot of time. Some students have to get up early every morning on w to get to school on time by bus or by bike. It cana long way from home to school. Teachers and parents should c down some of the homework so that the children can
e nine hours of sleep every night for their .