A lot of earthquakes happen in the world every year. Why do earthquakes happen? Scientists tell us the outside of the earth is made of a number of different plates （板块）. The plates move very slowly. Sometimes they stop and don't move for a long time. When some of the earth's plates move suddenly, an earthquake happens.

    Many earthquakes happen under the sea. Sometimes they happen near mountains. In fact, earthquakes may happen anywhere on the earth.

    During an earthquake, the shaking makes rocks rise suddenly and even break openly. Houses fall. People are killed or hurt. Sometimes whole villages or cities are destroyed.

    Scientists have studied earthquakes and made maps that show "earthquake belts". In the areas in these belts, it's possible for earthquakes to happen. In these areas we can make houses strong enough to sand against earthquakes.

    In the future, scientists will be able to predict（预言） exactly when and where an earthquake will happen. They can tell us what to do and how to do as well.

    I like pandas very much. They are very 1. Many of them live in Sichuan, 2. Pandas are beautiful animals. They are white and 3. They have big bodies(身体), 4sometimes they can also be quick. Pandas like to eat bamboo 5. They also like to sleep.

    Sometimes pandas go to other countries(其他国家). People there6 like pandas very much.

    There are not many pandas in the world. Now people know they are 7danger. They hope to help pandas 8 a good life. My uncle works in a panda center. It's9to go to the center. I can 10 many cute pandas there.

    Some day little cars may take the place of today's cars. If everyone 1 such a little car in the future, there will be less 2 in the air. There will be more parking places in the cities, and the street will be 3. Now the space for one car of the usual size can 4 more than one such little cars. Driving will be 5, because these little cars can go only 50 kilometres an 6. The future cars will be fine for going around the city, but they will not be 7 for going far away. The little cars 8 only two batteries, one battery for the motor, and the other for the horn (汽车喇叭) and the lights. If we still 9 the big cars along with the small ones; we will need to 10 two kinds of roads. That is, there will be some roads for the big fast cars and other roads for the smaller and slower ones.

    Nowadays many people are talking about aliens. You might see them 1.

They are very smart, but they look 2. They travel in spaceships.

    But are there really aliens in space? British scientist Stephen Hawking, thinks so. He says that people 3 look for aliens. He thinks they are dangerous.

    On a British TV programme, Hawking says, "It is 4 that there are aliens in space."

    "They might live in big ships. They have 5 all the resources(资源) from their home planet." he says.

    He thinks such aliens might get resources from Earth and then go away. They may bring 6 to the Earth.