People spend almost a third of their lives doing one thing—sleeping. Every year, there is a day for people around the world to celebrate the {#blank#}1{#/blank#} (important) of good and healthy sleep—World Sleep Day.

    Sleep is like food for the brain. Healthy sleep helps the body and brain grow and develop. People of different ages need different amounts of sleep. It is said that eight hours per night {#blank#}2{#/blank#} (consider) the average amount of sleep. For students aged 10 to 17, a healthy amount is about eight to nine hours per night. However, last year, the China Youth and Children Research Center {#blank#}3{#/blank#} (report) that about four {#blank#}4{#/blank#} (five) of middle school students didn't get enough sleep. For some students, they want to sleep early, but they keep {#blank#}5{#/blank#} (worry) about their schoolwork and can't fall {#blank#}6{#/blank#} (sleep) quickly. A lack (缺乏) of sleep can greatly affect (影响) a person's life. Students who don't get enough sleep may get poor grades. They cannot pay attention in class or do well in sports.

    {#blank#}7{#/blank#} (solve) this kind of problem, scientists advise that students should have {#blank#}8{#/blank#} (little) schoolwork and more time to sleep. There are some other ways to help people get enough sleep, such as {#blank#}9{#/blank#} (take) a 20-minute nap (午睡) during the day, trying to go to sleep earlier and so on . Good sleeping habits are also {#blank#}10{#/blank#} (help). For example, try to go to sleep and wake up at the same time every day, even on weekends and during the day.

    With time going by and science developing, there are some problems of the environment {#blank#}1{#/blank#} (become) more and more serious. Most of these problems are caused by human {#blank#}2{#/blank#} (activity).

    Many years ago, we might not hear of haze(雾霾). But now most of us more than know what haze is and learn the huge disaster caused by haze. For the past two years, haze has appeared in many cities, our life and health {#blank#}3{#/blank#} (affect) by haze.

    Recently, the topic of air pollution has again attracted more and more attention since pollution haze, a kind of weather, {#blank#}4{#/blank#} (appear) frequently in our city. When pollution haze came, the whole city was covered with suspended particles(悬浮颗粒), {#blank#}5{#/blank#}can be breathed into our body causing serious problems to our health. According {#blank#}6{#/blank#} reports, the haze attacked many large cities, such as Beijing, Tianjin, Chengdu and so on. All of the phenomena(现象) tell us that it's time to protect and improve our environment. Compared with the bad effect of the pollution haze, a green and clear environment rather than anything else turns to be {#blank#}7{#/blank#} important role and an urgent issue in our daily {#blank#}8{#/blank#} (life). Meanwhile we just have an earth.{#blank#}9{#/blank#} we don't try to protect our common hometown, we will die off as dinosaurs.

    Some of us think we human beings are so great that we can control nature. I just want to say how stupid the idea is! We shouldn't be the master of nature. And we should be a friend of nature so that we can survive a long time! If it is necessary, we should make some related laws to control pollution haze. And we can take example by England, because they {#blank#}10{#/blank#} (have) the same problem long time ago.