Have you ever planted a few trees on Tree Planting Day? Each year, millions of people, both  1 , plant a lot of trees. But this may not be the best way to make your home a  2 place.

   Last week we visited a park in Hebei. We were  3  to find most of the trees had been burned. The workers told us that the trees 4 soon after they were planted because they weren't watered well enough. 5workers burned them and cleaned the place for 6 trees to be planted this year. 7 a card found in one of the dead trees, a student wrote, ＂I hope this tree will grow up with me to   8   the backbone(栋梁) of our country.＂The workers said that the survival(存活) of the trees was really more important than  9   trees were planted.

    Some people in Beijing now have a new idea that they can donate(捐赠) some money and let professionals (专业人士) plant and  10  the trees.

    We know the earth is a planet．There are seven other planets，and they go  1 the sun together．The eight planets and the sun are2 the solar system．The first planet，3   the sun，is Mercury(水星)．It is 58 miIlion  4  from the sun．Venus(金星)is the second planetfrom the sun，and  5 planet，the earth，is the third．It is from the sun,and 55  planet,the earth,is the third.It is 2,650 million kilometres from the sun．

    Jupiter(木星)，Saturn(土星)，Neptune(海王星)and Uranus(天王星)are all 6 than the earth，7 Venus，Mars and Mercury are smaller than the earth．

    Animals，trees and humans can only 8  on the earth，because the other planets in our solar system don't  9  air or water．Do any  10planets in   solar systems have life?We don't know about it．

    Every year some people are killed or injured in road accidents.There are rules to 1the roads safe, but 2people do not always obey(遵守)the rules.They are 3.If everybody obeys the rules,the roads will be 4.How can we make the roads safe?Remember this rule:traffic must keep to the right.Cars,buses and bikes must 5keep to the right side of the road.Before 6the road,stop and look 7.

    Then,if you are sure that 8is clear,it is safe to cross the road.If you see small children, very old people,or blind people waiting to cross the road,it is 9to help them cross the road safely.

    We must teach children to cross the road safely.We must tell them 10on the street.We must always give them a good example.

    Man has invented four kinds of satellites. The first kind of satellites studies the1of the earth. They are used to make maps. They also help countries to see where they can2oil or gold.

    The second kind of satellites is used to3ships and planes. A ship or a plane can send a message to the satellite and can find out4it is.

    The third kind of satellites studies the weather. These satellites5clouds and strong winds moving across the earth. They warn countries to make preparations when very6weather is coming. They7of the earth from thousands of miles above it and send the photos to weather stations on the ground.

    8kind is used for communication. Telephone calls9countries can be sent by these satellites. Some can carry hundreds of calls at one time. The call is sent to the satellite then the10sends it to a station in the country and this country is being phoned. These satellites also carry pictures; they can receive and send about eight programs at a time.

    Can you imagine what life will be like in the future? Will life in the future be better, worse or the same as now?1do you think of the future?

    People2that life will be probably very different in 2050. First of all, planes will be very3so flying will be very cheap. Everyone will have a small car. Fuel will be new and clean, but expensive. We will4robots everywhere. And space planes will take us around the universe5two hours. Homes will be warm in winter and cool in summer, so they will be very comfortable. We will use the sun6our homes. Computers will be very small so they will be very7. People will do many things on the Internet.

    At that time, water will become one of our most8problems. In many places, farmers will be in great need of water to9fruit and vegetables.

    By 2050, we will be able to help blind and deaf people see again and10again. At that time, our life will become better and better.

    It says that bats (蝙蝠) are almost blind (瞎的). Do you know 1 the bat finds the way? In fact (事实上), bats find their ways 2 the help of their ears. Bats make a 3 that we can't hear at all. They cry when they fly and the echoes (回声) of these cries come back to their 4. In this way they can know where they should go. Bats fly out in the 5. In the daytime, they just stay together in their homes.

    When the evening comes, they begin to 6 and look for 7. The next morning, they come back from work to sleep 8 the evening. Some people 9 that bats are bad animals. In fact, they are very 10. They catch and eat pests (害虫). This is very good for people.