when we are a child or a elementary student, we want to be  a middle school student, because they don't  look like having  less homework, and teachers aren't serious with them.but we want to be a high school student as a middle student.then……we finally enter into a university,throwing away all of pressure, sharing compuse life. We gradually fall into bad habits, such as escaping from class, sleeping over time and playing games madly ect. we always complain our university ,our teacher, our profession. however, we are not ever think ourself, we are always playing, playing ,playing……and waste  a lot of time ,at the end.we can't do anything.