Each one of us shares this planet with about seven billion others. And we all need1. People and products need to move from city to city and country to country. However, we all know2most cars, motorcycles, boats and planes cause air pollution. They are also noisy. This is a serious problem in many cities.3inventors are coming up with creative ideas to try to reduce the air pollution and noise.

    In many cities around the world, motorcycles are very4. Now Vietnam has around 33 million motorcycles and China has almost 120 million, Motorcycles are a faster and cheaper way to get around a city than5. Yet air pollution is a growing problem. In large cities, people complain it is difficult to breathe. To solve these problems, a US company designed an environmentally friendly motorcycle. It uses electricity as fuel (燃料). As a result, there is6pollution. It's also quiet and fast. This makes it a good choice for getting around a city.

    The Italian city of Venice is a city with only a few roads. There are no cars in the city centre.7cars, water taxis and buses carry people along the city's canals. However, they cause pollution,8to the water. English engineers Dick and Jem designed a solar powered(太阳能的) water taxi. The water taxi can run for a day after being charged.

    Planes also cause air and noise pollution. Designing an environmentally-friendly airplane is a real9. Some airplane companies have10to solve the problems. Swiss engineers have gone one step further. They developed a solar airplane. This plane holds the world record for the longest solar powered flight—1, 541 kilometres from Arizona to Texas in America.

    Suppose you find a bright yellow bike on a street corner in the city. You hop on(跨上)it and 1. But wait—isn't this stealing? No, it isn't. 2 shouts, "Stop! Thief!" That is 3 this free ride is just fine with the city.

    You 4 find hundreds of free yellow bikes in some US cities. The idea began in Portland, Oregon, in 1994. People saw a need for 5 transportation, and they wanted to help 6 pollution. So, to get citizens(市民) 7 their cars and onto pollution-free bikes, they 8 the Yellow Bike Project.

    The 9 bikes are painted bright yellow and placed throughout the city. People can hop on the yellow bike and ride to run errands(短程差事), to work 10 to school. Then, they leave the bike for the 11 rider. There have been times when bikes have been stolen, but most people 12 the rules, because they think it is not wise to 13 the bike that's already free.

    Portland's 14 was quickly loved by a lot of people. Within two years of its starts, similar programs were 15in cities in six other states.

It was a cold afternoon. Ginny and I were walking home after work {#blank#}1{#/blank#} suddenly a young man came. He asked Ginny if she wanted a hug. {#blank#}2{#/blank#} sign which read "Free Hugs" was in his hand. There were other people with him. They {#blank#}3{#/blank#}( hold) their handmade signs high.

"Sure!"Ginny smiled and walked up to him {#blank#}4{#/blank#}(slow). She hugged him with all the love she had in her heart. "Wow!" he said. "That is {#blank#}5{#/blank#}(warm) hug I've had all day!" Then the young man asked.me {#blank#}6{#/blank#}(give) a hug. I walked into his open arms and said, "You.got it!" Then we parted.

A young lady walked up {#blank#}7{#/blank#} hugged Ginny. Then she hugged me too. I felt the warmth filling my heart. Ginny and I were going through a hard time. We were stressed and worried {#blank#}8{#/blank#} life, but on that afternoon, for a short moment, it was forgotten completely.

"‘Free Hugs' was to reach out and hug a stranger to brighten up their lives," said the young man. Ginny and I stepped back and watched them work their magic with those who accepted {#blank#}9{#/blank#} (they). They offered hugs to everyone.

It took a simple hug to make all {#blank#}10{#/blank#}(thing) better.

No one was sitting on the park bench. I went over and sat down, sighing. I felt my life was hopeless because my whole world was 1 . Just then, a young boy walked up to me, out of breath. He stood right before me and said with great 2 , "Look what I found! "He had a flower in his hand. 3 the petals were all dry. I told 4 to go away politely, and faked (假装) a small smile. But he shook his 5 . He sat down next to me and put the flower to his 6 . He said, "It smells pretty and it's beautiful, too. That's why I 7 it. It's for you. "The flower before me was dying. I knew I must 8 it, or he might never leave. So I reached for the flower, and replied, "Just what I need." Just then, for the 9 time I noticed that boy could see 10 . He was blind. 

Tears came down my face as I 11 him for picking the best one. "You're welcome," he smiled, and then 12 . I sat there and wondered how he was able to know I was 13 . Through the eyes of a blind boy, I found it was me who can't see the beautiful world, 14 I was blind in my heart. Then I decided to see the beauty in life, and 15 every second of my life.

On the stage of America's Got Talent, 11-year-old Tyler Butler Figueroa played the violin well. Also, he touched many people's hearts {#blank#}1{#/blank#} his story. Tyler comes from North Carolina {#blank#}2{#/blank#} he was four years old, he had a health problem and started to lose hair. He felt sad. The feeling got even {#blank#}3{#/blank#} when his classmates laughed at his look. And they stayed away from him. One day, Tyler saw a flyer (小传单) for free after-school violin lessons at school. He knew he was not {#blank#}4{#/blank#} in music, but he decided to learn to play the violin. "I practiced {#blank#}5{#/blank#} in my room every day," he said. "{#blank#}6{#/blank#} the violin could help me to forget the bad things." Tyler's mother said the violin made him {#blank#}7{#/blank#} again and she felt like she had her son back. Tyler stood strong, {#blank#}8{#/blank#} he had to face those bad things. He {#blank#}9{#/blank#} a book. He wanted to share his story with other kids like {#blank#}10{#/blank#} and told them to be strong.

Do you know Liu Xiuxiang? This name might be strange to you but you must have heard about the story of him. He was born in March, 1988. His father died of illness when Liu Xiuxiang was four. He had to support the whole family. Life was difficult, but be went on studying hard. Finally he got into the university. Because his mom wasn't able to look after herself, he "carried" his sick mom to his university while studied in Shandong in 2008.

After he graduated from university in 2012, Liu refused many highly paid job and went back to his hometown, Guizhou Province. There he has been working as a teacher for 9 years. He said, "I hope to do something for more children whose lives are similar to mine."

In fact, Liu supported three poor children when he was in high school. Till now, he has helped more than 1,700 students and given more than 1,000 speeches in his spare time.

Liu's story has warmed many people. And he also received many honors(荣誉，成就), such as the Star of Self-improvement of Chinese College Students, the May 1st Labour Medal in Guizhou Province, the May 4th Medal of Chinese Youth, the National excellent teacher and so on.

As the song sings "What doesn't kill you makes you stronger." There is no doubt that he will give more hope to more children in the future.