It's ten o'clock in the morning. It's raining heavily. The students of Class 3 are in the computer room. It's time for them to begin their computer lesson. Since the teacher hasn't arrived, the students are acting badly. Jenny is talking loudly and excitedly. Beside her, Tony is eating something. Mike is playing games on the computer and Mary is putting down her wet umbrella near the computer, which may be bad for the computer.

    Where is Emma? Oh, she is still on the way to the computer room.

    Rules of the Computer Room

Jenny:⑴{#blank#}1{#/blank#}

Tony:⑵{#blank#}2{#/blank#}

Mike:⑶{#blank#}3{#/blank#}

Emma:⑷{#blank#}4{#/blank#}

⑸{#blank#}5{#/blank#}

    James Watt was an English boy. He liked asking questions and was always thinking hard.

    One day he was sitting in the kitchen with his grandmother. There he saw a kettle (壶) on the fire. Some steam began to come out of the kettle. The lid (盖子) was shaking. "Grandma, what's in the kettle?" he asked. "Water, my child… nothing, but water." "But I know there is something else. It pushes the lid up. How did the steam get under the lid?" "It comes from the hot water."

    The boy said to himself, "The steam must be very strong. It can push things. If there is more water, the steam will be much stronger."

    Many years later James Watt tried to make steam work for people. He gave the world the first engine.

    Eaten any wood today? You may have! And you possibly brushed your teeth with it and you are even dressed with wood. You might know that paper is made from wood. But we get a lot more from trees than paper! In fact, more than 5,000 wood products make our lives better each day. It's true! From toothpaste to photo film, wood products are all around us.

    Wood resin(树脂) is one of many chemicals we get from trees. When a tree gets hurt, resin will form as a protective(保护性的) coating around the wound to stop the insect. People collect the resin and use it to produce paint, glue and soap.

    There are also tree-based chemicals in many of the foods we eat and drink. Some of these chemicals are used to add colours to soft drinks, others to keep food from going bad too quickly. For example, snack food, milk shake and ice creams can be made with cellulose (纤维素) from trees.

    Our life is full of products that come from trees. Now, how many tree products can you see from where you are sitting right now?

    Most of us have never thought about building an educational toy by ourselves. If we need a learning toy or something, we simply go to the nearest store and buy it. However, things are not as easy in third world countries. With families even having no food to put on the table, buying toys, especially the educational ones, is the last thing on the parents' minds.

    So how can one get these kids interested in science？This was a question that worried the Indian engineer Arvind Gupta so much that he decided to give up a good job and spend his life making toys from trash, things that people no longer want or need!

    Mr Gupta began teaching in the 1970s. While still an engineering student at the Indian College of Technology, he volunteered to teach the children who could not afford to go to school. Upon graduation, he found a good job at India's Tata Motors and spent the next five years designing cars.

    But he soon realized that this was not something he wanted to do for the rest of his life. So he took a year's training course and took part in the Hoshangabad Science Teaching Program whose aim was to make science fun and exciting for poor children using available materials.

    Mr Gupta found the whole project so satisfying that he decided to leave his high-paying job and focus his attention on designing educational toys that were not only cheap and easy to build, but also full of scientific principles(原理) , so that children could get interested in this interesting subject.

    When the Internet started becoming a more widespread learning tool, Mr Gupta created a toys from Trash website and also recorded over 250 You Tube videos.

    Today, over 50, 000 children and teachers visit the website daily to download the videos for the toy creations based on cool science, Some young children have become so inspired(鼓舞) that they have even won international science competitions with the help of his creations