Nobody knows how many different languages there are in the world. The most widely used language is English. It's used by business people, airline pilots all over the world. It's also the first language of sports and science. So it's very important for us to learn English.

    English is most widely spoken in the world, while Chinese has the largest number of speakers. There are not only over one billion people living in China, but also many Chinese people living outside China. You can find large or small groups of Chinese people living in almost every country in the world.

    There are some other important languages in the world, too. Chinese is of course very important, especially in Asia. Arabic is widely spoken in many parts of Asia and Africa. Russian is spoken both in Europe and Asia. French is widely understood, not only in Europe, but also in parts of Canada, Africa and Asia. Spanish has a growing number of speakers all over the world, especially in Central and South Africa.

    What language do people speak in the United Nations? There are so many different languages in the world, but they decide to use only six of them. They are Arabic, Chinese, English, French, Russian, and Spanish. Everything spoken or written in one language is translated into the other five.

    The story of how the song Happy Birthday to You came to be, began as a sweet one that later sourced. Two sisters, Mildred Hill, a teacher at the Louisville, Kentucky Experimental Kindergarten, and Dr. Patty Hill, the headmaster of the same school, together wrote a song for the children, called Good Morning to All. As the local expert on spiritual songs, and as the organist（风琴师） for her church, Mildred combined her musical talents with her sister's knowledge in the area of Kindergarten Education, Good Morning to All was sure to be a success.

    The sisters published the song in a collection named "Song Stories of the Kindergarten" in 1893.Thirty-one years later, after Dr. Patty Hill became the head of the Department of Kindergarten Education at Columbia University's Teacher College, a gentleman by the name of Robert H. Coleman published the song, without the sisters'permission. What was worse, he added a second verse（歌词） Happy Birthday to You.

    Mr. Coleman's addition of the second verse made the song become well known and, gradually, the sisters' original first verse disappeared. Happy Birthday to You, the one and only birthday song, had altogether replaced the sisters' original title Good Morning to All.

    After Mildred died in 1916, Patty, together with a third sister, Jessica, discussed the issue together and took Mr. Coleman to court（法庭）, they proved that they, indeed, owned the melody（曲调）. The court finally decided that the family legally（合法地） owns the song, whenever it is sung for commercial purposes（商业目的）.

Stress is caused whenever there is a problem or a change in your life. Of course, everybody has stress more or {#blank#}1{#/blank#}; nobody's life is perfect. In fact, stress is necessary. Without stress, we would never learn anything or grow or change. We would {#blank#}2{#/blank#}be bored to death. {#blank#}3{#/blank#} too much stress can hurt you. It can weaken（削弱） your body's {#blank#}4{#/blank#} so that you easily catch diseases（疾病）. It can even make you more likely to {#blank#}5{#/blank#} .

When you feel stressed , your brain{#blank#}6{#/blank#} a message to your body to produce a chemical called adrenaline（肾上腺素）. Adrenaline makes your breathing and your heartbeat（心跳）faster. Today you have a different kind of stress. Problems like endless homework or {#blank#}7{#/blank#} with your family are the kind of things you can't fight or run away. {#blank#}8{#/blank#}so you don't use up all that adrenaline. So what you can do about stress? You can set up a plan to {#blank#}9{#/blank#}homework or go to a doctor to try to work things out with your family or your friends. It's {#blank#}10{#/blank#}to get enough sleep and eat healthy meals. Another thing that you can do is daily exercise. 

Note-taking is a skill that can help you do well in all your schoolwork. It can make you confident when you are studying. But unluckily， most students don't know how to take notes. 

If your teacher writes notes on the blackboard， that's great. You can copy them or write down the most important facts of all in class. Different teachers do things differently. For example， some teachers may focus on lots of dates and facts in class， but they only write the important ones on the blackboard. Other teachers may not write anything down， but they may repeat them. 

Don't try to write down every word in class， or you might miss some important points. Some students really learn better with the help of these notes. Don't be afraid to ask your teacher to repeat what you've missed. If your teacher speaks too fast and you can't follow what he is saying， you can ask him after class. Comparing your notes with your classmates' can be good for your learning. It can also help you and your classmates correct some mistakes. 

Note-taking also needs organization. Keep notes for each subject in one place， so that you can find everything easily when a test comes. Good note-taking takes time. If you decide to recopy your notes every evening， you'll surely have less time to watch TV. But you'll save time in the coming test. 

Taking notes(笔记) is an important part of learning. Students listen to the teacher. They write down the important things. Or they use a computer. These days, many students take a computer to class to type(打字) their notes. 

Some people think that using a computer is better. People type faster than they write. That means they can write more. If you can type fast, you can type every word the teacher says. 

Computers are becoming very common in classrooms. Almost every student in university has a computer small enough to take to class in order to type notes. Fewer students write things down. So there is a trend in schools now to spend less time on teaching kids how to write. Schools are moving away from teaching younger students how to write by hand. Many people see no need for writing by hand. 

However, studies advise that it is good to write things down. When people can't write every word, they have to think about it more. They have to pick out what is important. And the act of writing seems to help them to remember. Studies show that people who write down their notes remember the information better. A new study, done by Princeton University and University of California, found that students who took notes by hand learned more than those who used a computer. In the study, 65 university students listened to the teacher and took notes with pens or computers. Then they did tests about how well they remembered and understood the lesson. Results show that pen users do better than those who take notes with their computers.