The world's population is larger and larger. There will 1 much more people next century. The earth will be more crowded and there must be a little room 2 each person. Perhaps there will be 3 room only on the earth a few centuries later. That will be serious to humans.

    So human are 4 of a good way to solve the problems.

    The moon is the 5 that is nearest to us. Maybe man will 6 on it some day. According to the scientists, studying, we know that there is no air, no plants, no water and no life there. So scientists are doing experiments 7 many ways. They 8 solve a lot of problems 9 humans can live on the moon. I'm sure the dream must 10 in the future. Maybe it is in the next century.

The US public uses about 50 billion water bottles a year and most of those {#blank#}1{#/blank#} bottles are not recycled, according to Elizabeth Royte's book Bottlemanid: How Water Went on Sale and Why We Bought It.

More than $100 billion is spent every year on bottled water in the U.S. in many developing countries where there isn't a safe {#blank#}2{#/blank#} of tap water, bottled water is the only choice.

In the US, tap water is controlled by the government and often {#blank#}3{#/blank#} for dangerous substances(物质). Each American drinks 79 litres of bottled water per year {#blank#}4{#/blank#}. The bottled water industry is so successful that it has outpaced milk, coffee, and juice in the number of gallons of drinks sold – putting it behind only beer and soda.

    We all know that the panda is the treasure (珍宝) of our country. Then how about its droppings (粪便)? They are treasure, too. How?

    The panda keeper1an adult panda with about 25 kilos of bamboo every day. Of that, the panda will eat about 11 kilos — the most2parts. Because the panda cannot digest (消化) all the bamboo completely, its droppings3much of undigested (未消化的) bamboo. Can people make use of it? Sure, someone4in turning it into toilet paper.

    "In my opinion, it's a great5 ， " a panda keeper says. "In the past, we just threw away the droppings6rubbish. But now workers come and take the droppings away. They use the droppings to make7. They also make notebooks and bookmarks. "

    8 ， the paper doesn't sell well at the Panda Base. It is not popular with9. Most of them won't buy it after they visit the Panda Base. "A box of tissues (纸巾) is 43 yuan ， " they said. "That's quite10. " If you see the tissues at the Panda Base, will you buy them?

    When talking about inventors, who do you first think of? Forget Thomas Edison. Meet the teenage 1 at the 24th Jiangsu Adolescents Science &. Technology Innovation Contest(江苏青少年科技创新大赛).

    Wang Xingyu, from Kunshan No. 2 Middle School, invented "a 2 line" in the zebra crossing. Wang often saw people running through

the red 3 , so he thought of an idea,

    "I 4 a spray tube(喷管) in the zebra crossing. When the light is red and 5 crosses, it sprays water. If the light is 6, it will not work," said Wang.

    But does it 7 water? "There's a water channel(槽) on the ground, so the water will be collected and 8 again," he said. Zong Hangchen, from Nantong Special Education Middle School, also got his invention idea from daily experience.

    Zong's 9 could only feel a little light. When he walked on the sidewalk for the blind, he often came across obstacles(障碍物). Once he 10 hurt his nose.

    11 help himself and the blind, Zong made something that has radar(雷达) and a loudspeaker. Users tie radar onto their knees and 12 the loudspeaker around their necks. When they meet obstacles, the radar will see them and the loudspeaker will make a 13 to tell the users.

    Chen Huijuan, an official from Jiangsu Association for Science and Technology, was 14 at these inventions.

    15 some ideas are simple, the creations are very good," she said. "Get inspiration( 灵感) from small things in life and you can be an, inventor, too.