People say time is money. But it is more precious than money. Money lost can be recovered, but not the time lost. A moment lost is lost for ever. Time is ever changing. Change is the law of nature. Nothing is independent of change or time. Man’s life is very short but the work is much and difficult. There are so much to do. Therefore, we should not waste even a single minute. Every breath, every second should be used properly and meaningfully. Our school work, home task, hours of rest and sleep, time of recreation and exercise, etc., should be well planned and organized.