【正确答案】Habits, good or bad, are gradually formed. When a person does something repeatedly, a habit is developed by an invisible force which drives him to repeat it. Once formed, it is hard, sometimes even impossible to get rid of it. Therefore, it is of great importance for us to take great caution in training a habit. Children are prone to form bad habits, some of which will remain throughout their life. Elder people also tend to grow bad habits, which, under certain circumstances, may ruin themselves. Some habits developed in one's earlier life turn to be a blessing. Many successful people have claimed that lots of their achievements were attributed to the habits acquired in their earlier life, such as punctuality, honesty, perseverance and rising with the lark.