One bag, that's it.

The importance of packing light cannot be overemphasized(过度强调). Limit yourself to 20 pounds in a carry-on bag. A 9'× 22' ×14' bag fits under most airplane seats. And after you enjoy that sweet mobility and freedom, you'll never go any other way.
You'll walk with your luggage(行李) more than you think you will. Before leaving home, give yourself a test. Pack up completely, and practice being a tourist for an hour. Fully loaded, you should enjoy window-shopping. If you can't, go home and thin things out.
Packing light isn't just about the trip over and back—it's about your traveling lifestyle. Too much luggage marks you as a typical tourist. It slams the back door shut. Changing locations becomes an important operation. With only one bag, you're mobile and in control. Take this piece of advice seriously. Pack light, and pack smart. These days, you can't bring anything possibly dangerous—such as knives, lighters or large amounts of liquid (液体)—in your bag.
What to bring?
How do you fit a whole trip's worth of luggage into a small backpack or suitcase(衣箱)? The answer is simple: bring very little.
Bring out everything you think you might need on the floor. Pick up one item(件) at a time and check it. Ask yourself—not "Will I use it?", but—"Will I use it enough to feel good about carrying it all the way? The world is getting really small—you can buy Colgate toothpaste, Nivea cream and Gillette razors in almost every country.
Think about what you can do without—not what will be convenient on your trip. When in doubt, leave it out.

    Happiness is for everyone. You don't need to worry about people who have beautiful houses with large gardens and swimming pools or those who have nice cars and a lot of money and so on. Why? Because those who have big houses may often feel lonely and those who have cars may want to walk on the country roads in their free time.
    In fact, happiness is always around you if you put your heart into it. When you are in trouble at school, your friends will help you; when you are studying hard at your lessons, your parents are always taking good care of you. When you get success, your friends will say congratulations to you. When you do something wrong, people around you will help you to correct it. All your happiness is always around you.
    Happiness is not the same as money. It is a feeling of your heart. When you are poor, you can also say you are very happy, because you have something else that can't be bought with money. When you meet with difficulties, you can say loudly you are very happy, because you have more chances to challenge yourself. So you should not always say you are poor and you have bad luck. As the saying goes, life is like a revolving(旋转的) door. When it closes, it also opens. If you take every chance you get, you can be a happy and lucky person.

    Mary is having a birthday party. There will be a cake with candles. Some people will bring birthday presents. Let's look at birthdays in some different countries around the world.

    Argentina: Ear pulling. If you ate 13, they will pull your ear. They will pull your ear one time for each year of your age. If you are 13, they will pull your ear thirteen times.

    Denmark: Flag (旗). If it is your birthday in Denmark, a flag will fly outside a window of your home

    Philippines: Coloured lights. Some people put colored light outside their home if sometime is having a birthday.

    Russia: Birthday pies. Many Russian children get a birthday pie, not a birthday cake.

    When you have a birthday, here is a message for you "Happy Birthday" from all around the world.

    "In my country, men usually go to restaurants on their own. They always take their shoes off before they go in. Then they usually sit on the floor around a small, low table. In the evening they often sing songs."

    "You usually take chocolates or flowers. But you always take an odd number of flowers, and you remove the paper before you give them to the hostess. You can also send flowers before you arrive. You don't usually take wine except when you visit very close friends."

    "We always offer our guests something to drink when they arrive, tea, coffee or perhaps water or soft drinks. We think it is polite to accept a drink even if you're not thirsty. If you visit someone you always stay for a few drinks. When you have had enough to drink, you tap your cup or put your hand over it. If you say no, your host will insist that you have more to drink."

    "People's private lives are very important so they never ask you personal questions about your family or where you live or your job. They never talk about religion or matters of finance, education or politics, but usually stay with safe subjects like the weather, films, plays, books and restaurants."

    "It's difficult to know when to leave, but an evening meal usually lasts about three or four hours. When the host serves coffee, this is sometimes a sign that the evening is nearly over, but you can have as much coffee as you want."

"If the invitation says eight o'clock then we arrive exactly at eight. With friends we know well, we sometimes arrive about fifteen minutes before."

    "Obviously it depends on the occasion, but most dinner parties are informal. The men don't usually wear a suit, but they may wear a jacket and tie. Women are usually smart but casual."

    American people like to say "Thank you" when others help them or say something kind to them. People in many countries do so, too. It is a very good habit.

    You should say "Thank you" when someone passes you the salt on the table,  when someone walking ahead of you keeps the door open for you, when someone says you have done your work well, or you have bought a nice thing, or your city is very beautiful. "Thank you" is used not only between friends, but also between parents and children, brothers and sisters.

    "Excuse me" is another short sentence they use. When you hear someone say so behind you, you know that someone wants to walk past you without touching you. It's not polite to break others when they are talking. If you want to speak to one of them, say "Excuse me" first, and then begin talking. You should also do so when you begin to cough or make any noise before others.

    Let's learn to say "Thank you" and "Excuse me".