and students should have more free time to e_ what they like

and students should have more free time to e_ what they like
More and more middle school students in Beijing are getting shorter sleeping time. Most students sleep fewer than nine hours every night, because they have much homework to do. Some homework is given by school teachers, and some by parents. Also, some students don’t know how to save the time. They are not careful enough while doing their homework, so it takes them a lot of time. Some students have to get up early every morning on weekdays to get to school on time by bus or bike. It can be a long way from home to school.
Schools and parents should cut down some of homework so that the children can enjoy not less than nine hours of sleep every night for their health.