Everyone knows water is important to all living things. But do you know these interesting 1 about water?

    Without water, the Earth would look 2 the moon. People can live several days without food, but only3days without water. Scientists say 70% of the human body is made up of water. Water 4 up 83% of our blood, 70% of our brain, and 90% of our lungs (肺). About 95% of a tomato is water, and about 80% of an apple is water. So 5 can we do to help with water problems?

   Keep a shower to 10 minutes or 6 time. It helps save much water. Use a broom to sweep the floor, the stair, the garage (车库), or the sidewalk instead of water.

     7 throw your used water away. Instead, you can use some to water plants or run the toilets. Use a bucket (桶) of water to 8 your bike or the  family car instead of water pipes.

     Use water only 9 you need it. Don't leave water running. Be sure to turn the tap 10 when you are not using it.

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.

    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.

    When US student Olivia Priedeman, 17, woke up one morning, she thought she had had a dream about making plans with a friend.

    But it wasn't a dream. Her phone showed that during the night, Priedeman had read a text message from her friend. She did it while she was fast asleep.

    Reading and sending text messages while asleep called─ "sleep texting"─ is an unusual sleep behaviour, similar to sleep walking. It's also a growing problem among doctors: young people can't live without their cell phones.

    One in three teenagers sends more than 100 text messages a day, according to the Pew Internet & American Life Project. And at least four out of five teenagers said they sleep with their phone on or near their bed.

    Elizabeth Dowdell, a professor at Villanova University in Pennsylvania, has studied sleep texting. She said that having a phone nearby all night is a big part of the problem.

    Andrew Stiehm, a sleep medicine researcher with Allina Health in Minnesota, agrees. It's possible for the part of the brain that controls skills to wake up, while the part of the brain that controls memory and judgment(判断) may be still asleep. That's why some people can perform basic movements-such as walking, talking, texting or even driving while they're sleeping. Some of Dowdell's students said that they're disturbed by their nighttime texting behaviour. But because sleep texting is unconscious, it's a difficult habit to break. Dowdell said she knows of some students who wear socks on their hands to keep themselves from texting.

    Marjorie Hogan, a doctor at Hennepin County Medical Centre in Minneapolis, Minnesota, suggests keeping all electronic products outside the bedroom.

    Robots seem very new to most people. But they have a 1 history. A Greek scientist made the first robot. You may 2 robots in some movies. The robots in the movies are usually stronger, faster and 3 than people. In real life, most robots are used in factories. They can do lots of dangerous, difficult or4 jobs. Some people can't look 5 themselves and robots can help them. For example, some people can't see, and they use a guide dog to help themselves move. But now scientists are making a 6 to help them.

    Robots are also used in American hospitals. At one hospital, a robot 7 meals from the kitchen to the sick people's rooms. It never loses its 8 because it has a map of the hospital in its computer system(系统). 9 the future, robots will even work in space. But robots will 10 take the place of(代替)people but only work for people. They can, however, help us in a lot of different ways.

    As we know, there are four seasons in a year. When spring 1, it's getting warmer and warmer. Everything comes back to life. Trees turn 2. There are beautiful flowers and grass here and there. Children can 3 kites in the sky. 4 summer, the weather becomes hot. 5 people can take part in more activities outside, such as running in the morning, taking a walk in the evening, going camping, 6 in the river, travelling with family, and so on. 7 comes after summer. It's a harvest season. We can taste 8 of fresh fruits. The weather is neither too hot nor too cold. People feel comfortable. It usually snows in winter in my home town. Snowing 9 me excited. Children are 10 in making snowmen outside. A heavy snow will predict a good year. The four seasons bring us happiness and pleasure. We should love and treasure (珍惜) them.