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.

Jo has been dying to get a p    1    from home because she has been in the s    2    school with clay floor and roofs of grass for a month. When she reaches the school ground, she is greeted by a     3     of “good morning” from the students. Science is the most challenging subject as students     4     of doing experiment. The other day, Jo was showing the boys the chemistry experiment when the mixture was bubbling over everywhere and the boys started jumping out of the windows. Sometimes she wonders how r    5    the chemistry is to these students—few will ever become chemists.

Last weekend, Jo and Jenny visited Tombe’s home, a low, round bamboo hut with grass     6     (stick) out of the roof, where they could only see a few     7    , including one broom, a few saucers, a kettle, cups and a couple of jars. For dinner, they 1    8    stones on fire to heat and placed the hot stones with ingredients to steam. They used a can standing u    9    on the grill over the fire to dry out the leftover food in case leftovers attracted bad spirits. It was such a p    10    to have spent a day with Tombe’s family.

The future home will use     1    to tell when you leave home each morning, and then     2     all by itself. You will no longer have to     3     yourself.

After two years of working for work as a teacher, Einstein took a job as a clerk in the     4    , out of     5     knowledge, he continued to study,     6    physics.

According to Tu Youyou, the discovery of artemisinin was a team effort. Upon hearing that     7     Prize, she said, The honour is not just mine. There is a team behind me. and all the people of my country. This success    8     Chinese Medicine. It is indeed an honour for     9    and    10     to be spread around the world.