It can be easy for some of teenagers to form bad habits. These bad habits, if     1     (leave) unchecked, could lead to more serious ones when they become adults. To prevent harmful habits like these from     2     (支配) a teenager’s life is essential. To change bad habits is never easy, even with many     3     (attempt). Aristotle once said: “We are     4     we repeatedly do.” We make a choice to do something, and then we repeat     5     over and over again. Soon that choice becomes automatic and forms a habit. The good news is that we can change by understanding how habits work. we must first learn about the “habit cycle”, which works like this: Firstly, a “cue”, an action, event, or situation. Then a “routine”, the regular action you take     6     response to the cue. Thirdly, there is the “reward”.

    7     (facilitate) a positive change in our bad habits, we must first examine our bad habit cycles and then try to adapt them. Many of us try to change bad habits quickly, and if we are not successful, we often become     8     (悲观的) and give up. In fact, the most successful way to change is not suddenly, but over a period of time. As the Chinese philosopher Lao Zi wrote, “A journey of a thousand miles     9     (begin) with a single step.” To reach the goal of change, a person must show some d     10     . After all, it is not easy to break bad habits.