Most teens need more than 9 hours of sleep each night. But about 1 in 4 teens has trouble in sleeping. Lack of sleep can affect everything from our feelings to how well we focus on tasks like studying. It can also influence sports performance, increase our chances of getting sick, and may lead to weight gain in some people.

    How can we get the sleep we need? Here are some ideas:

    Be active during the day. Get at least 60 minutes of exercise a day. Physical activity can decrease stress and help people feel more relaxed. Just don't work too close to bedtime because exercise can wake you up before it slows you down.

    Say goodnight to electronics. Experts suggest using the bedroom for sleep only. At least shut everything down an hour or more before lights out.

    Keep a sleep routine. Going to bed at the same time every night helps the body expect sleep. Creating a bedtime routine can improve this relaxation effect. Reading, listening to music, spending time with a pet, writing a diary or doing anything else can relax you.

    Expect a good night's sleep. Instead of worrying that you won't sleep, remind yourself that you can. Say "Tonight, I will sleep well." several times during the day. It can also help to practise breathing exercises or gentle exercises before bed.

    Everyone has a sleepless night once in a while. But if you regularly have trouble in sleeping and you think it's affecting your mood or performance, talk to your doctor.

{#blank#}1{#/blank#} It's a kind of promise. Most of the time, we make promises to other people. ("Mom, I promise I'm going to tidy my room when I get back from school.") However, promises you make to yourself are resolutions, and the most common kind is New Year's resolutions. {#blank#}2{#/blank#} When we make resolutions at the beginning of the year, we hope that we are going to improve our lives. Some people write down their resolutions and plans for the coming year. This helps them to remember their resolutions. Others tell their family and friends about their wishes and plans. 

There are different kinds of resolutions. Some are about physical health. For example, some people promise themselves they are going to start an exercise program or eat less fast food. Many resolutions have to do with self-improvement. {#blank#}3{#/blank#} Some people might say they are going to take up a hobby like painting or taking photos, or learn to play the guitar. Some resolutions have to do with better planning, like making a weekly plan for schoolwork. {#blank#}4{#/blank#}

Although there are differences, most resolutions have one thing in common. People hardly ever keep them! {#blank#}5{#/blank#} Sometimes the resolutions may be too difficult to keep. Sometimes people just forget about them. For this reason, some people say the best resolution is to have no resolutions! How about you — will you make any next year?

Are the classrooms all the same in the world? 

In China, children have a fixed classroom. In a classroom, you can see desks and chairs in lines and many other school things in order. There are usually about 40 or more students in every class. They always face the blackboard. What are classrooms like in other countries? Let's have a look! 

In the UK, most classrooms are similar (相似的). There are usually about 30 students in every class. Usually, two children share a long desk. 

In the US, classrooms usually have single (单独的) desks for each student. There are about 15 to 25 students in a class. The US children don't have a fixed classroom. They always go to different classrooms when the classes are different. 

In Japan, students have a fixed classroom. They also have single desks. At the back of the classroom, there are places for students' clothes. At the gate of the school building, there are places for their shoes.