Have you ever been to Yellowstone National Park，a national park primarily in the US state of Wyoming（怀俄明州）？At Yellowstone National Park，① ． When they are heated for more than a few minutes，they will break up．

    In Atlanta，the USA，there is a popular restaurant which is very special．In the restaurant，waiters no longer throw uneaten food into litter cans．Instead，② ．

    In America，a new activity known as"zero waste"is becoming popular．It is carried out in schools，cafes，gyms，parks，restaurants and other places．"Zero waste"activity calls on people to produce less litter．It encourages people to reuse whatever they can．

    Although the idea seems a little unrealistic （不现实的），it is necessary．According to a new report，American people produce the largest amount of the litter in the world．Each person produces almost 4.6pounds of litter every day．More than half of the litter which is put into landfills is harmful ． Actually，this is bad for the environment．Besides this，more landfills（填埋场） are needed．

    "Nobody wants to have a landfill lying near his house，"said Jon D．Johnson from the Environmental Protection Agency，which helps to carry out"zero waste"activity．"There are not enough landfills，so we can't put all our litter into them．We should try to recycle it as much as we can．"

    How long does it take to build a new house? It usually takes about six months or more. But each year, thousands of people work together to build new homes in just four months! Who does this wonderful work? Habitat for Humanity. Habitat for Humanity is a group that builds homes for families in need. It has branches in different states around the USA. This group works all over the world, too. Volunteers help build the homes. They are unpaid workers. Volunteers can be builders and painters. They can be teachers or bankers. Some are students.

    Habitat for Humanity has built more than 300,000 houses. More than 1.5 million people live in these houses. Building a home is hard work. Volunteers learn how to put up walls. They use tools and machines. These selfless volunteers work with the family that will live in the house. Everyone works together to make the family's dream come true.

    Suruchi Srikanth has worked with Habitat for Humanity for four years. She began volunteering in high school. She has built many homes with other volunteers. She takes her responsibilities(责任) seriously. Volunteers know that if they don't help, homes might not get built. They are good citizens(公民) who care about other people.

    I'm Anna, This is my sister Lily's room. It is always tidy(整洁). This is her desk and that is a chair under the desk. That is a bookcase on the desk. You can see many(许多) books and model planes in it. My brother Paul makes(制作) these model planes for her. Look at the tape player on the desk. It is white. Where are the tapes? They are in her bag. Where is her bag? It is on the chair.

⑴{#blank#}1{#/blank#} Taking measures(措施)to use less water is something you can start doing right away. If you live in an area with a water shortage, this is even more important for the environment.

⑵{#blank#}2{#/blank#} Chemicals are used to wash our bodies, homes, cars and everything else, and end up in the water supply. Chemicals are doing real harm to water.

⑶{#blank#}3{#/blank#} Coal and natural gas are the most common sources of energy that can be turned into electricity. The burning of these things is a main cause in world air pollution. Reducing your reliance(依赖）on electricity is a great way to play a part in saving the planet.

⑷{#blank#}4{#/blank#} If you can drive and fly less often, you'll do a lot to help save the planet.

⑸{#blank#}5{#/blank#} You don't have to travel far to get what you need. Making smart choices about where your food, clothes and other products come from can help make a difference to the environment.

⑴{#blank#}1{#/blank#} Chen Jin likes doing sports. He wants to live near a park.

⑵{#blank#}2{#/blank#} Meng Ting only likes Chinese food. He hopes his host family can speak a little Chinese.

⑶{#blank#}3{#/blank#} Liu Li likes living in a big bedroom cheaper than f350 a month. She doesn't like pets.

⑷{#blank#}4{#/blank#} Han Ping loves pets. She would like a bedroom cheaper than £220 a month.

⑸{#blank#}5{#/blank#} Liu Jun hopes to live near his school- Reading School. He'd like a bedroom with a bathroom.