Many people have cars in the city. But pollution is a problem because of the{#blank#}1{#/blank#}. Nowadays some downtown (市中心) areas around the world don't have cars. These car-free zones (无车区) are{#blank#}2{#/blank#} for people, bicycles, and public transportation only.

     Eight million people{#blank#}3{#/blank#} in the center of London and another two million people go to work there every day. The downtown area is very{#blank#}4{#/blank#} with hundreds of cars, buses, and taxis, but there are {#blank#}5{#/blank#}a lot of beautiful parks with free music concert. At lunchtime, many people go there for a rest {#blank#}6{#/blank#} they get off work.

     Parts of Tokyo are always crowded with hundreds of people - but no cars! These modern car-free zones are{#blank#}7{#/blank#} popular and people like shopping there.

     In the past, Bogota was polluted because there{#blank#}8{#/blank#}lots of cars and traffic. Now the downtown area is car-free zone and the air is{#blank#}9{#/blank#}! Many people don't have a car and half a million people take the bus{#blank#}10{#/blank#}. There are lots of stores. It's not expensive.

    This term we have a new English teacher from Australia, Mr Green. He teaches very well and is {#blank#}1{#/blank#} to us.

    Last Sunday some of my classmates and I went to visit him. He cooked some Australian food for us. We taught him {#blank#}2{#/blank#} to use chopsticks and the way of making dumplings.

    He had an interest in making Chinese food. He also told us a lot of western customs(习俗). For example, when they have dinner in a restaurant together, they {#blank#}3{#/blank#} keep quiet.

    When it was time for us to leave, I said to him, "Come to my home for dinner when you have time." He looked happy and asked, "When?" But {#blank#}4{#/blank#} fact, I was just to be polite. From that, we could see the {#blank#}5{#/blank#} from country to country.