When migrants（移民） arrive in the US, they face a world that can be confusing in many ways. They need to learn to live in a different environment. Some laws and rules are written down. They can learn about them before they arrive. But there are lots of "unwritten rules," too. Unwritten rules are behaviors that no one talks about, but that most people understand.

    Here is a list of five important issues any new arrival to the U.S. should know about.

    Be "on time." In some cultures, time is not a big issue. If you tell your friend to meet you at 2 p.m. and you arrive at 2:45 p.m., there is no problem. In the U.S., people feel that being on time is a sign of respect. If you are late by more than a few minutes, people will think you do not care. They will feel you are wasting their time. They will take your lateness as an insult.

    Be sure you always "tip." In many countries, after you eat at a restaurant, you only pay the amount shown on the bill. But, in the U.S., people who work in restaurants and bars often earn a low hourly wage. So, they try to provide excellent service, hoping the customer will give them a "tip," meaning a little extra. People in the U.S. tip between 15 percent and 20 percent of the bill. You also give tips to taxi drivers, hotel employees and the people who cut your hair.

    Be careful what you say. Any place you go there will be some things that are proper to talk about and some things that are not. Supposing that people have the same beliefs as you is a bad idea. In the past decade, people in the U.S. have become more open about discussing strong political and religious views. But it is still best to listen to people share their opinions first and then decide about sharing your own. Also, there are several topics you should avoid asking questions about: how much money a person makes and if they are married. But if a person offers this information, then there is no problem.

    Be polite for the situation. People in the U.S. define being polite in very special ways. For example, waiting in line involves a strong set of rules in this country. You must wait until the people in front of you have done what they are waiting to do. When going through a door, the person behind you expects you to hold the door for them. Also, it is common for people you do not know to say hello to you when passing you. But this does not always mean they are inviting you to stop and talk for a long time. Many times the person is just being friendly. If you don't say hello back to them they may think you are being unfriendly.

    Today is Sunday. Mr. Smith drives the car to the zoo with his family. They want to see animals. They get to the zoo at 9:00 in the morning.

    They see smart elephants, cute pandas and many other animals. Mrs. Smith's favorite animals are elephants. They are very friendly and they have long noses (鼻子). The elephants from Thailand can draw very well. They're one of Thailand's symbols. Look at the small panda. He looks unhappy. He can't find his mother. The visitors(游客) can see the animals, but they can't give them food. Too much food isn't good for them.

    Welcome to the zoo and play with them.

Today is Sunday but Jack is going to school. He goes to tennis school. The tennis lessons will start1 ten o'clock. Jack is very 2 because his tennis teacher，Ms Brown，is a great teacher. She wants 3 Jack to be stronger and play better. 

Ms Brown tells Jack if he has4 good rest，eats healthy food and practises hard every day，he can 5 very strong and good at6 tennis. Jack believes her. He decides to eat a lot of fruit and vegetables and go to bed 7 every night. He also exercises a lot. 

In Jack's town，there isn't a public（公共的） place to play tennis8 Jack can't play tennis every day. Jack and his friend Emily often go 9 in the park after school. 

Next month，Emily will take tennis lessons 10 Jack. Jack is glad to hear about this ﹣ they can go to tennis school together!

In 1944, a young man carrying a bag filled with books knocked on the doors of Mr. Wu Dayou's house in Kunming. {#blank#}1{#/blank#} young man was there to ask Wu to let him study in the then National Southwest Associated University (NSAU/Xinan Lianda) , where Wu was a professor. {#blank#}2{#/blank#} (surprising) , just 13 years later, the seemingly common young man won the Nobel Prize in Physics. This man is none other than Mr. Tsung-Dao Lee.

During his years spent in NSAU, Lee quickly grew intellectually. He often {#blank#}3{#/blank#} (find) himself asking Wu after lessons for more work and would often search for {#blank#}4{#/blank#} (know) outside of the courses. 

Lee entered the University of Chicago's Graduate School {#blank#}5{#/blank#} just 23 years old and began researching physics. In 1956, he became {#blank#}6{#/blank#} (young) full professor at Columbia University. One year later, he, along with Chen Ning Yang, won the Nobel Prize in Physics. 

When Lee returned to China in the spring of 1979, he {#blank#}7{#/blank#} (invite) to teach two classes at the University of Science and Technology of China. He badly wanted more Chinese researchers {#blank#}8{#/blank#} (understand) the progress the world has made in the past decades. {#blank#}9{#/blank#} he established the CUSPEA program in 1979, which supported 915 Chinese students to study in the U. S. 

Although he was living abroad. Lee remained connected to China. His legacy serves as an inspiration (激励) for future generations to pursue {#blank#}10{#/blank#} (they) dreams and make a positive difference to the world.