Empathy(同情心) lets us feel another person's pain and drives us to help. Do any other animals feel empathy? Scientists recently found that rats(老鼠) do, too.

    Most people don't like rats. In many people's eyes, rats are only bad. But Jean Decety and his partners at the University of Chicago did an experiment. It showed that rats are kind, warm-hearted animals. They can feel each other's pain.

Scientists placed pairs of rats in plastic cages(笼子) for two weeks. During this time they got to know each other. Then they put one of the rats from each pair into a small container(容器) in the cages. The small container had a door. It was so designed as to fall to the side when the free rat touched it. Many of the trapped(困住的) rats squeaked(吱吱叫) to show their discomfort. The other rats of the pairs could see their suffering friends clearly.

In most pairs, the free rats would become very worried about their friends. They kept trying to save their friends again and again throughout the month. Scientists put the rats' favorite chocolate in the cages, but the rats didn't eat it until they had saved their friends successfully. Scientists also found that female rats seemed to act more empathetic than male rats.

    “The results are the first to show that rats take action in response to another's trouble,” Decety said. “Monkeys and chimpanzees have similar behavior. But unlike those animals, rats can be ready used in laboratory studies. They will help us to learn which parts of the brain lead to empathy and helping behavior and whether empathy is natural.”

    We live in computer age(时代). People 1 scientists, teachers, writers and even students use computers to do all kinds of work. But more than 30 years ago. 2 couldn't do much. They were very big and expensive. Very few people were 3 in them and knew how 4 them. Today computers are smaller and 5. But they can do a lot of work. Many people like to use them.

    Computers become very important because they can work 6 than people and make fewer mistakes. Computers can 7 people do a lot of work. Writers now use computers to 8. Teachers use them to help teaching. Students use them to 9. Computers can also remember what you 10 them. Computers are very useful and helpful. They are our friends. Do you want to have a computer?

    How could we live without the Internet? That's1most of us keep in touch with friends, find cool places to visit, or get the latest2. We can use it to do homework, find out what new movies are on, get information3a college (大学) we're thinking about, or find a job. Almost(几乎)4we can think of has a website about it.

    5you've heard stories about people who are cheated(被骗) in chat rooms. Some users don't tell others their true names. Everyone in the chat room looks like6a mask(面具). Some people may want to do something7in it. They will sometimes ask visitors for their information. The information might be about their families, or where they8. It shouldn't be given away. This might9you or your family.

    Of course, the Internet is home to millions of places you can and should visit. However, remember to10yourself while online.

    Every year some people are killed or injured in road accidents.There are rules to 1the roads safe, but 2people do not always obey(遵守)the rules.They are 3.If everybody obeys the rules,the roads will be 4.How can we make the roads safe?Remember this rule:traffic must keep to the right.Cars,buses and bikes must 5keep to the right side of the road.Before 6the road,stop and look 7.

    Then,if you are sure that 8is clear,it is safe to cross the road.If you see small children, very old people,or blind people waiting to cross the road,it is 9to help them cross the road safely.

    We must teach children to cross the road safely.We must tell them 10on the street.We must always give them a good example.

    Can you imagine that we could build a beautiful city with rubbish? Maybe you will think it is1. However, it can be true! Nothing is a waste if we have a creative mind. Let me show you something about 2rubbish.

    Sometimes we can see tons of rubbish in the streets, on the roads, near the buildings... here and there.  Many large cities became so ugly 3 it. Nobody likes rubbish, but in fact, some rubbish can be used again. All of us want to solve the problem, we must do something to 4 rubbish. We should take action from now on. 5, some good things will not be wasted.

    Do you often throw away things you don't need any more? Have you ever thought about how these things can actually be put to good use? For Example, when a car gets too old, it may not run any more. But we can use the metal of the car to make something else. When a bottle is empty, it 6 as waste. You don't know bottle glass can be made into sand and used to build streets. Rubbish7food can be changed into fertilizer to make plants grow better. It is cheap and safe. And other rubbish can also be used to make building blocks. Now, 8machines are designed for that.

    9, people will watch films in a beautiful cinema which is built out of rubbish. Besides buildings and roads, cities may be made from rubbish. But so far, building beautiful cities made from rubbish is only 10.