From time to time, we all get a bit down. Maybe we are feeling bad because we're not doing well with our goals. There are many reasons for feeling down, but I'm not able to discuss all of them. {#blank#}1{#/blank#}

    Make a list. Sometimes we are sad simply because we are troubled by all the things we have to do. {#blank#}2{#/blank#} Make a list of the most pressing things you have to do. Thus you're getting things under control. You can see, right in front of you, what you need to do, and that can pick up your mood.

    {#blank#}3{#/blank#} You've made a list, and you still feel puzzled? Well, get started on the first thing you need to do. Once you get into action, you'll feel better. And once you start doing something, you will feel much better than lying around feeling sorry for yourself.

    {#blank#}4{#/blank#} I like Brown Eyed Girl, the Kinks, the Ramones, or an upbeat Beatles tune. You might have your own brand of feel-good music. Whatever it is, let yourself move to the beat. It may just be what the doctor ordered.

    Talk about it. Get a best friend, family member or coworker you can talk to. {#blank#}5{#/blank#} It can also help you work out the reasons you're feeling down.

    With global warming and melting ice, it isn't easy being a polar bear anymore. Some studies have predicted that polar bears could die out by the end of the century. The good news is not all researchers think the bears are absolutely disappearing. Scientists at the American Museum of Natural History(AMNH) have published a new paper indicating that things might not be as bad for polar bears as some scientists expect.

To understand the reason for the researchers' cautious optimism, we must first understand the factors that are threatening the polar bear's existence. Polar bears consume a diet of mainly young seals. In order to hunt these seals, polar bears need to rest at the top of sea ice—the same ice that is increasingly melting for most of the year thanks to climate change. In another 50 years, experts expect that the Arctic will be too warm for sea ice to form for half of the year, leaving polar bears without a reliable food source and in serious danger of starvation.

As it turns out, alternative food sources for the polar bears aren't completely out of the question. For as long as biologists have tailed after the animals, they've seen polar bears eating animals found on land like caribou(驯鹿) and snow geese—as well as the snow geese's eggs.

    Can polar bears actually survive off these alternative food sources for long periods of time? To figure this out, researchers calculated the nutrients that a caribou and snow geese diet would provide. They found that even adult male polar bears would be able to obtain more calories than would burn in hunting these meals. Moreover, the food would provide the food lecessary to avoid starvation during the summer months.

    Unfortunately, not all polar bears have tended to seek food on land. That said, the researchers expect that necessity would push more polar bears to hunt on land to avoid starvation. They also expect that the bears could learn from their fellow bears how to hunt on land until the practice becomes second nature.

    [1]Stamp collectors usually collect stamps only from certain countries or regions. The traditional method of stamp collecting is to organize stamp collection according to the issue dates.

     [2]Of course, there are many    .  . You can collect stamps relating to a particular theme. For example, sport lovers may choose the Olympic theme. They try their best to find Olympic stamps issued by various parts of the world every four years. Some of them may want to concentrate on even more specific sport activities like ball games, gymnasium, swimming, etc.

     [3]If you like astronomy, you may be keen on collecting stamps describing the stars, planets, spacecraft, spacemen, etc. once you have fixed the topic, you no longer need to bother about stamps other than the theme you selected. Then, you can put all your effort to collect the stamps around it.

     [4]China issues zodiac animal stamps (十二生肖邮票) every year to celebrate the Lunar New Year. They are extremely popular and a lot of collectors wait patiently for 12 years to collect a full set of them. Hong Kong's Lunar New Year special stamp series began in 2000 with the Year of Dragon and the twelfth and final set was issued in 2011, the Year of Rabbit. Recently some Western countries have issued zodiac animal stamps, which attract a lot of attention as well.

     [5]You may choose any theme you like. However, you should bear in mind an essential point. The topic you choose should not be too narrow. Otherwise, it is very difficult to accumulate stamps around the topic. You will be depressed and even lose your interest in collecting stamps.

      [6]Collecting stamps with themes is especially popular among teenagers because there is a wide range of choices for them. The main challenge is how you organize and expand your collection around your theme.

    [1] Ashley Power's mother bought a computer for her when she was eight. When she was thirteen, she was surfing the Internet regularly, but she couldn't find anywhere for teenagers to meet and talk. And one day she thought, “If I had my own website, I'd make it a really interesting site for teenagers.”

     [2]So, when Ashley was sixteen, she launched her own website, called Goosehead. She had no idea how big a success it would be, but three years later, the site was the most successful teen site in the USA! It was getting 100,000 hits every day, and Ashley had about 30 employees.

     [3] After a few years, the website closed down. Then Ashley, who lives in Los Angeles, was asked to write a book called The Goosehead Guide to Life. The book is about how to design a website and start a business. It begins with a section called “All About Ashley,” where Ashley tells readers what it is like to be the boss of a company when you are only sixteen. “ I was so happy. But it was crazy in a lot of ways. I got very stressed. I mean, I was only sixteen — I didn't even have a car! If you were sixteen and you had your own company, you'd be stressed, too！“

     [4] In an interview Ashley gave advice to teenagers who wanted to start their own business, “Just be strong and have your dreams and work hard at them. And don't listen when ___.____, because I heard ‘no' a lot. Just keep going until you hear ‘yes'!”

    My name is Clara. I still remember that chilly December day, sitting in science class. I'd finished a worksheet early and picked up a Time for Kids magazine. A piece of news caught my eye. NASA was holding an essay contest to name its Mars rover (火星探测器). Before I even knew anything else about it, a single word flooded my 11-year-old mind: Curiosity.

    I couldn't wait for the bell to ring so I could get started on my essay. That afternoon, I raced home, sat down at the computer, and typed until my fingers ached. “Curiosity is an everlasting flame that burns in everyone's mind…”

Five months later, my mom received a phone call, and immediately, a wide smile spread across her face.

    On August 5, 2012, at 10:31 p.m., the rover named Curiosity touched down safely on the surface of Mars, and I was honored to have a front-row seat in NASA.

    Curiosity is such an important part of who I am. I have always been fascinated by the stars, the planets, the sky and the universe. I remember as a little girl, my grandmother and I would sit together in the backyard for hours. She'd tell me stories and point out the stars. Grandma lived in China, thousands of miles away from my home in Kansas, but the stars kept us together even when we were apart. They were always there, yet there was so much I didn't know about them. That's what I love so much about space.

    People often ask me why we go to faraway places like Mars. My answer is simple because we're curious. We human beings do not just hole up in one place. We are constantly wondering and trying to find out what's over the hill and beyond the horizon.

    More and more corporations are taking an interest in corporate social responsibility (CSR). CSR is made up of three broad layers. The most basic is traditional corporate charity work. Companies typically spend about 1% of pre-tax profits on worthy projects. But many feel that simply writing cheques to charities is no longer enough. In some companies, shareholders want to know that their money is being put to good use, and employees want to be actively involved in good works.

    Money alone is not the answer when companies come under attack for their behavior. Hence the second layer of CSR, which is a branch of risk management. Starting in the 1980s, with environmental disasters such as the explosion at Bhopal and the Exxon Valdez oil spill, industry after industry has suffered blows to its reputation.

    So, companies often responded by trying to manage the risks. They talk to non-governmental organisations (NGOs) and to governments, create codes of conduct（行为准则) and devote themselves to more transparency（透明）in their operations. Increasingly, too. they, along with their competitors, set common rules to spread risks.

    All this is largely defensive, but there are also opportunities for those that get ahead of the game. The emphasis on opportunity is the third layer of CSR: the idea that it can help to create value. If approached in a strategic way, CSR could become part of a company's competitive advantage. That is just the sort of thing chief executives like to hear. The idea of "doing well by doing good" has become popular.

Nevertheless, the business of trying to be good is bringing difficult questions to executives. Can you measure CSR performance? Should you be cooperating with NGOs and you're your competitors? Is there any really competitive advantage to be had from a green strategy?

    Corporate social responsibility is now seen as a mainstream. Big companies want to tell the world about their good citizenship with their devotion to social responsibilities. Done badly, CSR is often just window-dressing and can be positively harmful. Done well, though, it is not some separate activity that companies do on the side, a corner of corporate life reserved for virtue（美德）：it is just good business.

     (Note: Answer the questions or complete the statements in NO MORE THAN TEN WORDS)