We may learn from the news that the world is hungry. Many people in poor areas don't have enough food to eat. In fact, our world is also 1. We are still short of water though water 2 nearly 3/4 of the Earth. About 97% of water on the Earth is seawater and we can't drink it or use it to water plants 3 . People can only drink anti use the 3% of the water from rivers and lakes. What's worse, we can't use all of that because of water 4 .

    Now we are facing a serious problem-we need more water. First, we need to learn how to save water. Then we need to 5 ways to reuse water. Scientists have made a lot of studies. The 6 show that in many large cities and small villages, people 7 use water only once and then it runs to the sea or rivers. So we can reuse water. Last but not least, we should make full use of the seawater. Scientists are trying to solve the 8 —collecting clean water from seawater 9 we can do now is to save water and not to waste water. We cannot live long 10 enough clean water. So let's work together to do something.

    Natural resources are things that we use that come from Earth.  Out natural resources are limited(有限的). This means that they will not1 forever.

    Some are renewable, like when you plant a new tree when you2one down. Others are not renewable, like when you dig coal out of the 3.Once it is used, it is gone. People realize the4that Earth's natural resources are limited, and can do things to help save those resources.5you try to save a natural resource, you try to use less of it, so it does not run out so 6 One way that people save fuel, like gasoline, is by riding a bicycle or walking when the 7is short instead of driving everywhere. Water is a very important natural resource because we all need it to stay8. We can keep water9making sure that our pipes and taps do not leak(漏). We can also make 10 choices to save water, like only using the dishwasher or washing machine when they are full.

    Everyone can make contributions to protecting natural resources.

    Some day little cars may take the place of today's cars. If everyone 1 such a little car in the future, there will be less 2 in the air. There will be more parking places in the cities, and the street will be 3. Now the space for one car of the usual size can 4 more than one such little cars. Driving will be 5, because these little cars can go only 50 kilometres an 6. The future cars will be fine for going around the city, but they will not be 7 for going far away. The little cars 8 only two batteries, one battery for the motor, and the other for the horn (汽车喇叭) and the lights. If we still 9 the big cars along with the small ones; we will need to 10 two kinds of roads. That is, there will be some roads for the big fast cars and other roads for the smaller and slower ones.