Have you ever {#blank#}1{#/blank#} (stay) up late? If so, you know that not getting enough sleep can make you tired. Not sleeping enough can also make {#blank#}2{#/blank#} hard to think clearly the next day.

    Sleep scientists have long known that getting a good night's sleep is of great {#blank#}3{#/blank#} (important). It helps kids to be able {#blank#}4{#/blank#} (do)their best during the day.

    A recent study shows that sleep {#blank#}5{#/blank#} (help) improve problem-solving skills and {#blank#}6{#/blank#}(create) thinking. For the study, two groups of students answered {#blank#}7{#/blank#} math problems. The group that slept for eight hou rs solved the problem {#blank#}8{#/blank#} (correct) more often than the group that did not get enough sleeping.

    While you sleep {#blank#}9{#/blank#} night, your brain is busy doing its “homework”. It sorts out (整理) the information {#blank#}10{#/blank#} you get in the day. Getting enough sleep each night can improve your thinking ability. That will surely help you do your best at school. Experts say that, in return, can lead to better grades.

    I've lived in three Asian cities,and they all surprised {#blank#}1{#/blank#}(I) on the upside.In the case of China,here's {#blank#}2{#/blank#}I like it.

    It's modern and continues to develop all the time.They have modern {#blank#}3{#/blank#}(city),and excellent transport facilities, including their unmatched high-speed train network.They have excellent hotels,restaurants,and beautiful parks etc.

    There's a feeling of safety and {#blank#}4{#/blank#}(free) in Chinese cities.There's no need to tell you what to do and you can see from the behavior of the diverse crowd.People just do {#blank#}5{#/blank#}they want.In most places no policemen {#blank#}6{#/blank#}(see).Do you know that police in China don't have firearms? They usually do their job silently and behave reasonably, {#blank#}7{#/blank#} (add) to the security and order.

    The Chinese people are friendly.You will always get help even if you can't speak a Chinese word besides nihao, or they can't speak English.They'll spend time and go out of their way {#blank#}8{#/blank#}(explain) to you how to get somewhere,or how to buy {#blank#}9{#/blank#}train ticket.They'll {#blank#}10{#/blank#}(patient) and enthusiastically explain how to get what you need.They'll be positive and practical all the time while helping you.

    One Sunday morning in August I went to local music festival. I left it early because I had an appointment {#blank#}1{#/blank#}(late) that day. My friends walked me to the bus stop and waited with me {#blank#}2{#/blank#} the bus arrived. I got on the bus and found a seat near the back, and then I noticed a man {#blank#}3{#/blank#}(sit) at the front. He {#blank#}4{#/blank#}(pretend) that a tiger toy was real and giving it a voice. He must be {#blank#}5{#/blank#}(mental) disabled.

    Behind him were other people to {#blank#}6{#/blank#}(who) he was trying to talk, but after some minutes {#blank#}7{#/blank#}(them) walked away and sat near me, looking annoyed.

I didn't want to be laughed at for talking to him but I didn't like leaving him {#blank#}8{#/blank#} his own either.

    After a while I rose from my seat and walked to the front of the bus. I sat next to the man and introduced myself. We had {#blank#}9{#/blank#} amazing conversation. He got off the bus before me and I felt very happy the rest of the way home.

    I'm glad I made a choice. It made {#blank#}10{#/blank#} of us feel good.

    Senior citizens are the first to come to our mind when you think of hearing loss, but in a recent report, hearing professionals worry teenagers will soon outnumber aging adults {#blank#}1{#/blank#} it comes to living with hearing loss.

    The rise in popularity of personal audio devices from iPods to smart phones has had dangerous effect on the ears of those who use them most, teenagers! A research {#blank#}2{#/blank#} (conduct) by the World Health Organization finds that nearly 50% of teens {#blank#}3{#/blank#} (fall) into the habit of exposing themselves to unsafe levels of sound so far.

    A sound is considered unsafe when it goes beyond 85 decibels (分贝). At that level, it takes just 8 hours of listening over your lifetime to cause damage. The louder the sound is, the {#blank#}4{#/blank#} (little) time it takes to cause damage. Because hearing loss is {#blank#}5{#/blank#} (typical) considered a health problem for the elderly, it is difficult to convince already stubborn teenagers that they really are doing damage {#blank#}6{#/blank#} their ears.

    Young adults {#blank#}7{#/blank#} have been exposed to loud noise over a period of time may have some hearing loss symptoms. Their {#blank#}8{#/blank#} (able) to learn is compromised, and they may have difficulty developing social skills.

    In an effort to help teens better protect their hearing, we suggest {#blank#}9{#/blank#} (set) volume limits on personal audio devices. {#blank#}10{#/blank#} is also good to limit the amount of time exposed to noise and to take listening breaks to give the ears a rest.

    When Robert Lee was in primary school, he hated to see his classmates throwing away half-eaten sandwiches after lunch. His parents had taught him and his older brother not to waste food. “They said it was bad,” says Robert, 27.

    While {#blank#}1{#/blank#} (study) finance and accounting at New York University, Robert remembered this lesson and joined Two Birds One Stone, a food rescue club at school {#blank#}2{#/blank#}delivered, five days a week, uneaten pasta, vegetables and other leftovers (剩余食物) from the dining hall to nearby homeless {#blank#}3{#/blank#} (shelter).

    When Robert and fellow club member Louisa Chen entered a college {#blank#}4{#/blank#} (compete), they came up with a slightly different idea for a food rescue non-profit group—{#blank#}5{#/blank#} (it) program wouldn't have a donation minimum, would operate seven days a week, and would be staffed {#blank#}6{#/blank#} (entire) by volunteers.

    Surprisingly, {#blank#}7{#/blank#} idea stood out. Robert and Louisa Chen won the first place. {#blank#}8{#/blank#} the $1,000 prize, they founded Rescuing Leftover Cuisine (RLC) in July 2013. In just the first few weeks, Robert steam delivered a donation of enough noodles and meatballs to feed 20 people in line at a New York City homeless shelter that had run out of food. Only a year into his finance job, Robert gave up his six- figure salary {#blank#}9{#/blank#} (focus) on RLC. So far the organization {#blank#}10{#/blank#} (reach) sixteen cities around the country.

    China has built a high-speed passenger rail network in recent {#blank#}1{#/blank#} (year) and will continue to expand it. By the end of 2018, China's railway mileage (里程){#blank#}2{#/blank#} (reach) 131,000 kilometers, of {#blank#}3{#/blank#} 29,000 kilometers were high-speed rail. This accounted for 2/3 of the world's total high-speed rail tracks, making China's high-speed rail system the world's {#blank#}4{#/blank#} (large) high-speed rail network.

    China's high-speed trains are similar {#blank#}5{#/blank#} those of France's TGV, German's ICE and Japan's Shinkansen. The fast trains with a top speed of 250-350 km/h {#blank#}6{#/blank#} (call) CRH, China Railway High-speed.

    If you want to travel around China, the high-speed trains will be your ideal choice since they are clean, comfortable {#blank#}7{#/blank#} modem. Unlike on the conventional trains in China, nobody is allowed {#blank#}8{#/blank#} (smoke) on high-speed trains, not even between carriages.

    The seats are as good as those on the plane or even better. Most high-speed rail tickets have corresponding (对应的) seats, and only {#blank#}9{#/blank#} small number of standing tickets are sometimes sold on limited trains. There's never a crowd of people sitting in the aisles. The ticket prices for China high-speed trains are reasonable and, on most routes, the frequency of departure is very high, so people can buy tickets{#blank#}10{#/blank#}(convenient).