March 22nd is World Water Day. It started in 1993. It not only makes us think about the importance of water, but also calls on (号召) us to 1 and protect water. Today, we're facing terrible water problems. Among them, wastewater problem is especially2. And the subject of World Water Day in 2017 is “wastewater”.

    What is wastewater? It is used water. Usually, wastewater comes from homes, 3, hospitals and so on. It is produced by different kinds of activities, including washing the machines, taking showers and using the kitchen. The rain also 4 wastewater when it is running down the street during a storm. No matter where it comes from, this kind of water is sure to have5harmful in it.

    6must we treat (处理) wastewater? Wastewater has a big influence on our life. It causes both illness for us and pollution for the environment. We must care for our environment and our own7.

    How can we treat wastewater? Different kinds of wastewater need different ways of treatment. Wastewater 8 homes can be reused. Then there will be 9 wastewater. Also, factory wastewater has to be cleaned 10 it goes back to nature.

    The universe is really mystical(神秘的). Scientists have done lots of study about it but there is still much they haven't discovered.

    Scientists think that there 1 life on the earth for many many years. However, we haven't found life on any other planets 2

    There are eight planets going around the sun. The earth is one of them. There are humans, animals, plants and many other kinds of life on the earth. There is water and air, too. And compared to the other planets, the earth is not too 3 or too cold. None of seven other planets has av. environment like that of the earth.

    The sun and its planets are called the solar system, and our solar system is a small part of a 4 larger group of stars and planets, called the Galaxy or the Milky Way. There are 5 stars in the Galaxy, and our sun is only one of them.

    Scientists have also discovered many other galaxies in the universe. Their light has to travel for many years to reach us. So 6 is the universe? It is impossible to imagine.

    Scientists have sent spaceship to the planet Mars 7photos. They have even sent spaceships to travel outside 8 . However, no spaceship has traveled 9 to reach other stars in our Galaxy.

    When we see stars twinkling(闪耀) in the sky at night, we may think a lot:10 so many stars in the universe, is there life out there in space? If there is life on other planets, what life will be like there? What transports do they use to travel? Why don't they visit us? We do not know the answers…

    Mr. and Mrs. Brown are from America. They are now teaching English in Zhengzhou. Their son Jack is with them. Jack speaks English. They want him to learn some Chinese. Jack is in Grade Three in a Chinese school. He plays with Chinese children every day. He listens to Chinese, speaks(讲) Chinese, reads books in Chinese and writes in Chinese. He is doing well in his Chinese.

    Young children don't have the skills or knowledge to stay safe in heavy traffic. The following tips (忠告) will be helpful for you to keep your children safe in heavy traffic. {#blank#}1{#/blank#} As parents, make sure that you always set good examples. Your children will follow you and think it's OK to do like you. Teach your children to pay attention to traffic lights {#blank#}2{#/blank#} This helps them understand when it's safe to cross. Make sure that you walk between your children and the traffic, and hold their hands all the time.

    {#blank#}3{#/blank#} you can start to tell them the importance of traffic knowledge. Let them start to understand the reasons why they need to be so careful. Talk with them about road signs and traffic rules.

    Ask your children to play in a safe place. Never let them ride bikes on the road without an adult present at rush hour.

    The most important thing you can do is {#blank#}4{#/blank#} so parents encourage them to follow traffic rules. {#blank#}5{#/blank#} they'll volunteer to obey them. In this way, they'll be careful enough to keep themselves away from danger.