16．　　Around the world, people have different ideas about what good manners (礼仪) are.
　　When you go to restaurants in different parts of the world, it's (1)       to know the right and wrong things to do. For example, in China it's OK to (2)       a lot of noise (噪音) restaurant. In fact, if a restaurant isn't (3)       you may think there is something wrong with it.
　　However, in many western countries, restaurants are (4)       places. If a table is too loud, (5)       people who are eating there might even complain (抱怨) to the owner of the restaurant.
　　Paying the bill (账单)is also different from country to country. In China, one person usually pays for (6)      . In western countries, one person pays if he or she is entertaining lied (宴请宾客), but (7)       friends eat together, they usually share the cost. This is called going Dutch (均摊费用). Also, when westerners pay the bill, they usually leave some money for the (8)      . This is called "Leaving a tip". Leaving a tip is thought to be (9)       in the U.S. It's common to leave tips of 10%, 15%, or 20% of the bill, which is decided by how good the service is. Good waiters can make a lot of money!
　　The food people eat is different in the world, but you can (10)       the same kind of food in many countries. Chinese and Italian foods, for example, are popular all over the world.

17．　　Cats are animals of habits. They like to go to sleep about the same time every day and for a long time. They seem to have a natural clock inside them that tells them when to sleep. Cats increase their regular sleep with cat naps (打盹, 小睡). Some experts feel that humans could also benefit from his habit. Cat naps help to build up energy (能量) in the body. They are also a good way to get rid of (除掉)trouble! Since cats have the same moods (情绪) as humans, some scientists believe that people can improve their moods. People might become happier.
　　A number of famous people have copied cats by taking cat naps during the day. The naps would usually last from 15 to 30 minutes. Winston Churchill took cat naps. So did Presidents Harry Truman, John F. Kennedy, and Lyndon B Johnson. These famous men were known for their energy. They were also able to work long hours, often into the night. Napping was their secret.

18．　　Mr. and Mrs. Green had different ideas about where to go that weekend. Mrs. Green wanted to go to Florida, but Mr. Green did not want to go to Florida. He wanted to go to Maine.
　　"Florida is too hot in summer " Mr. Green said to her.
　　"Maine is quite cold, "said Mrs. Green. "I like swimming, but the water in Maine is usually not warm enough."
　　"Florida's too far, "said Mr. Green. "We don't have enough time to drive there. It'll take us more than two days."
　　Just then, the telephone rang. Mr. Green answered the phone. It was Mr. Green's mother, "Is that Jim speaking? Please come quickly. I need help. I'm calling from the hospital in Boston."
　　That stopped their discussion, and they set out for the hospital immediately.

20．　　Some teenagers think that newspapers are boring and only for adults. But that's not true. There are many interesting stories in the paper. You just need to make clear what you are looking at. "I spend about half an hour reading newspapers every day," said 15-year-old Gao Ming from Beijing. "I'm interested in things happening at school." School news is just one kind of news story in newspapers. There's also world news: from international (国际的) problems to pop stars.
　　Read the newspaper carefully, and we'll find different kinds of articles on the pages:
　　News stories — these stories are about events (事件). Reporters try to show all points of a story to help readers understand what happened. Reporters try to speak to as many people as possible. They also use pictures and numbers to show the readers that the stories are true. The newspaper Teenagers has lots of news stories on the news page and front page. When we read them, we learn more about the facts, not the writers' ideas.
　　Opinion writing — opinion writing is usually about something happening right now. But it isn't just facts. Here writers add (增加) their own opinions to the news. Writers pick only the facts that help back their ideas. They make readers believe that they are telling the truth (真相). This is usually the kind of story that gets people thinking. Go to "Speak Out" on Page Two for an example of opinion writing in Teenagers.
　　Advertisements — Don't get happy too early when you read them. Those sweet words and lovely pictures are just ways to get us interested in their products (产品)! People have to pay to put advertisements in newspapers!

21．A: Good morning, madam. (1)      
B: I'd like a T-shirt for my son.
A: (2)      
B: Size L. He is a tall boy. He loves cotton T-shirts.
A: (3)       It's made in China.
B: OK. Let me have a look. (4)      
A: 120 yuan. It's popular now.
B: But I'm afraid it's a little more expensive and I don't like the colour.
A: Do you like the black one? It's only 80 yuan.
B: Hmm, it looks nice. (5)       Thank you.
A: You're welcome.

41．　　Learning a new language isn't easy. For many of us, speaking the language is even harder! Here are some tips to help you become more comfortable in speaking English.
　　Tip 1: When you study, make your mouth do what mind is learning. If you read aloud, you make your mouth and your mind work. This will help you with both speech and pronunciation.
　　Tip 2: Talk to yourself as much as possible. You need to be comfortable making sounds in English. All over the day, talk to yourself in English! This will help you feel comfortable thinking in English. Then write down what you are saying and read it aloud.
　　Tip 3: Have a "study partner". Get together with him or her at least once a week and study together. Speak as much English as you can whenever you meet. Then you can help each other.

42．　　Many American families live busy lives. Every week, the children have sports, music l(1)            , club meetings, and many other activities, including (包括) hours of homework. The parents are busy, too. They work, take care o(2)             their homes, cook meals, and drive their children to activities. Some families do not have time to eat meals together more than once a week. One American community (社区) decides t(3)             it is time to take a break.
　　After seven months of p(4)            , the community of Ridgewood, New Jersey, takes one night off. They call i(5)             "Family Night", a night for families to spend time together. Sports teams stop their practice, and teachers do not g(6)             homework .
　　On "Family Night", families agree to run off their televisions. They a(7)             decide not to answer the telephone. Answering machines say, "Please call b(8)             tomorrow." Many families order take-out pizza and other take-out food so that they won't spend time cooking.
　　P(9)             activities include board games and card games. These games give families a chance to spend time together. Children and parents aren't so busy, and children don't spend so much time playing video games and watching television. On "Family Night", families r(10)             and spend the evening together. The town hopes to have many more "Family Nights".