Nowaday many tudent have many bad habit. For example,often eat nack, do not love port, littering, playing computer game too long, etc.Thee are bad habit. Thee habit have great harm. Often eat nack will caue tomach ache. Littering can damage the environment. Playing computer game for too long can caue viion lo and o on. Therefore, it i very important to develop good habit, which i alo beneficial to our health.