15．　　We all have moments in our lives that we will never forget. For me, it was the first time I (1)       a bike. I was about eight years old. Being the youngest of the neighborhood kids, I was always treated like a little baby. I couldn't do most of the things they could do, and it was easier for (2)       to leave me behind.
　　One day, after being left out of a game of following the leader, I was sitting on my porch and crying. I felt sorry for myself. I was a loser. I was left out all the time. I didn't know how to do anything and never tried to (3)      . However, it was the right time to change the situation. I stood up with great determination (决心) and (4)       myself that I would learn to ride a bike.
　　Luckily, it was summer vacation so I could (5)       all day long. I started with my sister's old bike that had training wheels. I mastered that in a few days and moved up to a regular bike. For the next few days, I scraped (擦伤) my knees and hurt myself so many times that (6)       a bandaged grape.
　　Little by tittle, however, I fell (7)       often and I could go a few paces without my mother (8)       me. The neighborhood kids were having a bike race the next month, and I decided to take part in it, too. I started to practice longer and work harder than ever so I could (9)       my skills to others in the race.
　　The kids were quite (10)       when I appeared at the race. I rode my bike with them happily. Let's just say that after that, I never got left out again.

16．　　Emma has just finished traveling alone in Europe. Are you interested in her journey? Let's read some of her travel diaries.

17．Suspended (待用的) Coffee
　　This story will warm you better than a coffee on a cold winter day.
　　One day, my friend and I entered a little coffee house and ordered two cups of coffee. While we were waiting, two young men came in and began to order, "Five cups of coffee, please. Two of them for us and three suspended." They paid for their order, took the two and left. I asked my friend: "What are those suspended coffees?" Instead of giving me the answer, he told me to wait and see.
　　Some more people came. Two girls asked for one coffee each, paid and went away. Then came three lawyers who paid for seven coffees—three for themselves and four suspended. While I still wondered what the suspended coffees were, I enjoyed the sunny weather and the beautiful view in front of the coffee house. Suddenly a poor man like a beggar came into the coffee house. He kindly ordered a suspended coffee and sat there to drink it.
　　At that moment, I knew the meaning of the suspended coffees. It's simple—people pay the coffee in advance (预先) for someone who can't afford it. The tradition with the suspended coffees started in Italy, but it has spread all over the world. Meanwhile, I understood suspended coffee is not only a cup of coffee, but also the warmth and love to someone in need.

18．　　After eight months of living with other astronauts in the International Space Station (ISS), with four months to go before his space task is finished successfully, Scott Kelly said he could use some more workmates from the earth. "There are people on the ground we expect to meet. I'd be nice to have them here, too," He told over 60 middle school students on November 19^th, 2015, when they communicated through a live video chat.
　　The students, who were attending East Sid Middle School in New York City, brought questions for Kelly and his fellow NASA astronaut Kjell Lindgren. The two space explorers floated on the video screen as they listened to the questions, and occasionally flipped (翻动) their bodies even to show the students the danger of living in a zero-gravity environment.
　　"Floating in space is something you never feel you could get used to," Lindgren said. "But after you are up here for a month, it feels natural. It's much fun to float."
　　The students were excited about the program and about asking the astronauts and the other speaker questions about how the astronauts clean the ISS, which freeze-dried foods taste best and the most surprising things about living in the station.
　　Evan McKiernan asked what it's like to drink water on the station given that human urine (尿) is recycled on the ISS. "We don't think about it too much." Lindgren said, "In fact, the water tastes great—it tastes like fresh water." He called the recycling progress "important technology to have as we think about going on the Mars. We're going to need technology like that so that we needn't bring everything we need with us."
　　The program included comments (评论) from Jeffrey Kluger, an author at TIME magazine who is good at writing about science and technology. Kluger explained how 17 countries worked together to build the ISS. Additionally, Matthew Pearce, an education expert, brought samples (样本) of the packaged foods the astronauts eat and the special type of sleeping bag the astronaut use.

19．　　No one wants to work at a messy desk and look lazy or sloppy. But does a messy desktop actually make you either of those things? Not all disorders mean you're out of control. Even Steve Jobs thought his personal charm came from his messy desktop.
　　People who prefer a messy desk have their own ideas. Some think it makes them comfortable. A too-tidy room can sometimes make them uncomfortable, because it seems there is no place to rest their feet. Some believe it helps them concentrate more easily. Messy tables can make it easier to focus on the tasks, just like some novelists can write patiently in a noisy cafe. Others may be perfectionists. For those who strive for perfection, tasks are either 100% or 0% performed. Therefore, they usually put away the less important things and perform the most important ones perfectly, which leads to paper mountains on the desktop.
　　Many people are labeled as "sloppy" and "inefficient" because of messy tabletops. However, when we see the desks of Albert Einstein, Mark Twain and Mark Zuckerberg—pioneers of their times—things might change. Obviously, the world embraces uniformity and order, it also never refuses regular disorder, which seems like a mess but runs in an organized way.
　　In an experiment done by psychologist Kathleen Vohs, participants (参与者) were asked to come up with new uses for ping-pong balls. Both participants in the messy and clean offices created the same number of ideas. However, those in the messy room came up with more interesting and creative ideas. People who don't keep a neat and tidy desktop can actually develop organizational skills and manage work and thoughts successfully, even while swamped in (淹没于) piles of books, notes and documents.
　　In spite of great disorder, a messy desktop presents information clearly, which can sometimes inspire us unconsciously (无意识地). Research has found people working with a messy desktop are more likely to be creative and willing to take risks, while people with a tidy one tend to follow the rules and are less likely to try new things. Vohs says, "Disorderly environments seem to inspire breaking free of tradition, which can produce fresh insights."
　　But a messy desk might not be ideal all the time. When you need new ideas, a messy desk might be a good choice; but when you want to be efficient (高效的) and perform a task successfully, it seems better to make a desk clean and tidy.
　　No matter what kind of desk you prefer, we hope you feel comfortable and enjoy it!

20．　　You may think that inventions are far away from your everyday life. But in fact, most people can invent. It's just that they do not know that their idea could be the start of an invention. Once inventors see their ideas have some practical value, they don't let them go away.
　　For example, the inventor of the dishwasher, American Josephine Cochrane, loved to give dinner parties. But she found it took too long to wash her dishes by hand and too many of them broke. She decided that a machine could do the job faster and with fewer mistakes. So, in 1886, she started to make one for herself.
　　Like Cochrane's, most inventions are created to solve a problem. So, the first and most important step is to find the problem. Start by looking at what is wrong with things you use now and ask people around if they remember ever saying: "I wish someone would invent something for…" Then you might notice situations or things in need of improvement. The next step is to think about possible solutions. An invention is a new way of solving s problem. So think of many and unusual ways. You can often come up with a solution for a problem by thinking about it in a new way.
　　Most inventions are not completely new. They do not come out of nowhere, but of things or ideas that already exist (存在). And the hardest part of inventing, even for a lot of inventors, is coming up with a problem and finding a solution. Once you have an idea, you can always get help building your invention.
　　This problem-solving method can also work in your everyday lives. So, why not try it in your studies, in your relation with others, or even in the way you look at the world?

21．请根据英文和中文信息，写一篇意思连贯，符合逻辑的短文，不少于50词。请不要写出你的真实校名和姓名。
假如你叫Peter，你是一位正在北京旅游的外国游客，你想把你的旅游经历和感受分享给你的父母。请你按照如下提示写完邮件。文中必须涵盖所有提示问题的内容，提示词语供选用。
提示词语：capital, the Great Wall, snack, happy, prepare...
提示问题：
1) What have you done in Beijing?
2）What do you think of your travel here?
3）What's your advice for your parents if they want to visit Beijing?