Studying in the USA is very expensive. You need to spend $20,000 to $40,000 a year if you want to study in a university (大学) in the United States. In some universities, you may need to spend _________ money (over $40,000).

Many students work for long time to make money. If you start a full-time job, it is ______ that you will have to leave the university. It is even more _________ for undergraduate students (本科生). Graduate students (研究生) generally can manage (处理) well because they have fewer _________ to take. They can get work in their universities. However, universities _________ allow undergraduate students to do the work.

Students should not work out of school if the International Student Office doesn’t allow them to do it. Students can_________ at most 20 hours a week during term time and 40 hours during the holiday. If a student works longer, he or she may have to leave the university.

In the 13th century, the famous Italian traveller, Marco Polo, travelled a long way to China. During his stay in China, he saw many wonderful things. One of the things he discovered was that the Chinese used paper money. In western countries, people did not use paper money until the 15th century. However, people in China began to use paper money in the 7th century.

A Chinese man called Cai Lun invented paper almost 2, 000 years ago. He made ii from wood. He took the wood from trees and made it into paper. He then put these pieces of paper together and made them into a book.

Newspaper still comes from trees. We use a lot of paper every day. If we keep on wasting so much paper, there will not be any trees left on the earth. If there are no trees, there will be no paper. Every day, people throw away about 2, 800 tons of paper in our city. It takes 17 trees to make one ton of paper. This means that we are cutting nearly 48, 000 trees every day.

Since it takes more than 10 years for a tree to grow, we must start using less paper now. If we don’t, we will not have enough time to grow more trees to take the place of those we use for paper.

So how can we save paper? We can use both sides of every piece of paper, especially when we are taking notes. We can choose drinks in bottles instead of those in paper packets. We can also use cotton handkerchiefs and not paper ones.

When we go shopping, we can use fewer paper bags. If the stop assistant does give us a paper bag, we can save it and reuse it later.

Everyone can help to save paper. If we all think carefully, we can help protect trees. But we should do it now before it is too late.

Traveling by train is usually not easy in China. It can be hard to get a ticket. When you’re traveling to the railway station you look at your watch, afraid you will miss your train.

But there is good news for people traveling between Beijing and Shanghai. Construction（建设）on the express railway between the two cities started just before the Spring Festival of 2008. When it is finished by 2013, taking a train will be as easy as taking a bus.

“There will be trains every several minutes. Buying a ticket, getting through the checkpoint（检查）and taking your seat, will take just 10 minutes,” said an engineer. There may be high-speed trains running at 350 kilometers an hour. The travel time between the two cities will decrease from 10 to about 5 hours. The trains will carry twice the present number of passengers.

The new line will be 1,318 kilometers long and go across specially built bridges. It will run alongside the present line. There will be 21 stations in Hebei Tianjin, Shandong, Anhui and Jiangsu.

“The cost of traveling by the express railway may be around 800 yuan. That will be more expensive than an ordinary train, but cheaper than by air.” Said Zhang Xiaoling, a Jiangsu government official.

According to Zhang, the higher price is caused by the large cost of the railway project. At about 200 billion yuan, the project may be even more expensive than the Three Gorges Project（三峡工程）.

There is no one like you in the world, so you should learn to be happy with yourself. As we all know, nobody     46     (be) perfect. So if you are not the most beautiful or     47     (smart) person, that's okay. If you feel that you need to make yourself better, try your best     48     (change). If you have tried your best, but you still can't make yourself happy, try this way. Ask yourself two simple     49     (question). First, are you happy with who you are?     50     the answer is yes, there is nothing to worry about. If you're okay with     51     (you) and you've done your best in everything, you should be happy. Second, have you given yourself enough time     52     (make) yourself better? You know it takes time.

Self-confidence (自信) is also very     53     (importance). If you are confident, you'll be okay with the things you do.     54     here is some advice if you're not confident. First, find out your talents (天赋) and try to use them. Second, don't always compare yourself     55     others. Third, forgive (原谅) yourself for some mistakes you have made.