Today I'm talking to Harry Brown．Harry once volunteered(义务)to teach in Cambodia．

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A：In 2015.1 went with some friends who also wanted to volunteer there．It was a two．month volunteer experience．

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A：I taught English twice a day at an orphanage(孤儿院):0ne class in the morning and one in the afternoon．And most nights I stayed back to watch them perform(表演)traditional dances for visitors of the orphanage．And in my free time during the day,I just played games with them．

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A：The children that I met at the orphanage．The time I spent with them was the most unforgettable(令人难忘的)part of my volunteer experience．

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A: For me，there was nothing more difficult than teaching English to children at the orphanage．I have to say,there was a really big difference in the degree(程度)of understanding from one student to the next．

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A：Special and wonderful．When I first walked through the gate of the orphanage，I knew that my two-month volunteer experience would be one that l would always remember．The children there were very,very friendly．I enjoyed every minute of my visit from teaching to playing，and dancing!

根据材料内容从方框中选择合适的句子填入材料空缺处，使材料内容完整、正确，其中有一个句子是多余的。

    Do you clean your school desks every day? If not, then maybe it's about the time for you to get started. Keyboards, computer mice and telephone dials are infected (polluted) with lots of germs(细菌), according to scientists from the University of Arizona, the US.

    The study suggests that office equipment should be regularly cleaned. “Desks are in fact germs' cafeterias(自助餐厅),” said Charles Garbage, a biologist who took part in the study. “They are breakfast bars, lunch tables and everything else.” The desks at your school are probably not different.

    The scientists found that telephones in workplaces have almost 4,000 germs/cm², keyboards 500 and computer mice around 250. The office as a whole contains 4, 750germs/cm².

    When some people catch a cold or flu, they leave germs on the surfaces(表面) they touch during the day. Some flu germs can live on the surface for up to 72 hours, so the germs can easily move to other people. If you're ever wondered why everyone catches the germs when only one student has a cold, now you know the answer.

    Experts in the US last month warned about the spread(传播) of the germs during flu seasons. They reminded Americans to cover their noses and mouths while sneezing, often wash their hands and clean their office desks.

Hand washing is the most important. Killing germs during hand washing is useful only if you clean carefully with soap and water for at least 30 seconds. You should pay close attention to cleaning your thumbs, fingertips and fingernails.

    Hello, boys and girls. My name is Tony Smith. I'm twelve years old and I'm from London, England. It's a big and busy city. My favourite colour is green and it's the colour of trees. Swimming is my favourite sport. In summer, I often swim with my friends. I have a pen friend. His name is Jim Brown and he'.s eleven years old. He's from New York, America. Yellow is his favourite colour and he likes playing basketball very much.

Some information about Tony and Jim

I went to Grand Canyon (大峡谷) National Park in July 2012 for the firsttime and I knew I wanted to work there as a park ranger（管理员）. Park rangers protect the park's animals, plants, land, buildings, andpeople.

Now, as a park ranger forGrand Canyon National Park, I share the science, history and beauty of this parkwith thousands of visitors from around the world.

National parks are like outdoormuseums. Park rangers have all kinds of jobs, depending on where they work and whatthey studied during college. I teach school field trips（实地考察）, work at visitor centers and helppeople stay safe during their visit.

My favorite part of my jobis showing children their first look at the Grand Canyon during school field trips.Children are often amazed at the canyon's size and colors. Sometimes, they thinkit looks like a painting.

Being a park ranger requiresa lot of energy. I walk several miles and talk with hundreds of people each day.Park rangers must enjoy working with people and speaking in front of groups. Nearly5 million people visit Grand Canyon National Park every year.

Park rangers must also beprepared for any situation. Recently, I broke a traffic jam(堵塞). It was caused by a huge elk（麋鹿）standing in the road. Elks can become dangerous when they get scared,so I asked visitors to stop their cars and take pictures from far away. Believeit or not, I also help protect people from monkeys. It is not allowed to feed animalsin national parks. But sometimes, visitors try to feed monkeys.

There are a lot of famous cartoon characters. Here is some information about them.

Rick, a school boy, had a love for playing video games. Every day, his 1 reminded him to take some exercise instead of playing video games. However, he didn't always 2 .

Once again, Rick's mom told him seriously that his eyesight(视力) might get poor if he spent too much time on video games. It was a pity that he still didn't listen 3 . He kept playing. One day, during a math class, Rick's teacher got 4 when he couldn't give an answer to a question like"2+2=?". After class, the teacher asked him why he couldn't solve such a 5 problem. Rick said that he knew the answer but couldn't see the board clearly. His teacher was worried and 6 his parents. Realizing what had happened, Rick's mom warned him again that it was harmful to his 7 to play video games too much. And Rick's dad took him to an eye doctor for a check-up. The 8 showed that his eyesight

had weakened. After asking about his habit of using eyes, the doctor advised Rick to take action to protect his eyes.

From that day on, Rick decided to 9 playing video games and take some exercise every day. Later Rick fell in love with sports and 10 his school soccer team. Now he has become stronger and healthier. His eyesight has also got better.