We are lucky to live in a rich country where we have many things. However, most of us usually {#blank#}1{#/blank#} (waste) some things.

    Electricity is one thing that we waste most. Lights, TVs, {#blank#}2{#/blank#} (radio) and other things are often kept on even when no one is using them. We should turn them off {#blank#}3{#/blank#} we do not need them. It takes  {#blank#}4{#/blank#} (little) than a second to do it. Anyhow, not wasting electricity saves money, because we do not have to pay for the electricity we do not use. The {#blank#}5{#/blank#} (two) thing that we often waste is water. Fresh water is precious, so it shouldn't be wasted. It is only a simple matter of turning {#blank#}6{#/blank#}a tap. I am sure everybody can do this {#blank#}7{#/blank#} (easy) if he wants to. Another big waste is food. My mother used to cook so much food that much of it was thrown away. I told her we had wasted so much {#blank#}8{#/blank#} (food). She thought I was right and now cooks mainly what we can eat.

    It is not right to be wasteful. I find there is a simple way of not wasting things. That is {#blank#}9{#/blank#} (use) only what we need. Do not touch what we do not need. {#blank#}10{#/blank#}this way, we can stop being wasteful.

    Many people know that rubbish is a big problem on planet Earth. What many people don't know is that junk (垃圾) has become a problem in outer space too.

    According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. And these are just the things that we can see from the surface of the earth by telescopes (望远镜). There are also millions of smaller pieces of junk that we can't see.

    Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage the vehicle.

    To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U. S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.

    To reduce additional space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth's atmosphere after that time. In the upper parts of the atmosphere, it will burn up.

    Many scientists are also suggesting different ways to clean up space junk. In England scientists are testing a metal net that can be fired into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely destroyed.

    "The problem is becoming more challenging because we're sending more objects into space to help people use their mobile phones and computers," says Marco Castronuovo, an Italian space researcher.

    "The time to act is now. The longer we leave the problem, the bigger it will become," he says.

    You either have it, or you don't—a sense of1that is. But2is it that some people could find their way across the Sahara without a map, while others can3themselves in the next street?

    Scientists say were all4with a sense of direction, but it is not properly understood how it works. One theory is that people with a good sense of direction have worked hard at5it. Research being carried out at Liverpool University supports this idea and suggests that if we don't use it, we lose it.

    Children as young as seven have the ability to find their way6,"says Jim Martland, Research Director of the project. "However,7they are not allowed out alone or are taken everywhere by car, they will8develop the skills. ”

    Jim Martland also emphasizes that young people should be taught certain9to improve their sense of direction. He makes the following suggestions:

    If you are using a map, turn it so that it10to the way you are facing

    If you leave your bike in a strange place, put it near11like a big stone or a tree. Note landmarks on the route as you go away from your bike. When you return, go back along the12route.

    Simplify the way of finding your direction by using lines such as streets in a town, streams, or walls in the countryside to guide you. 13your steps 14you know how far you have gone and note any landmarks such as tower blocks or hills which can help to find out were you are.

    Now you will never get lost15!

In San Francisco, there is a special group of volunteers. They call themselves Friends of the Urban (城市的) Forest (FUF). These volunteers want to {#blank#}1{#/blank#}. Every year, the FUF plants nearly 1,000 trees.

The FUF welcomes new volunteers all year round and in all parts of its work. On Weekend Planting Days, FUF volunteers work with common citizens (市民) to plant trees. The planting usually runs from 9 a.m. to 1 p.m. After the work is done, everyone {#blank#}2{#/blank#} over a community lunch.

On Thursday Planting Days, the FUF plants "replacement (替换) trees". As their name suggests, these trees replace trees {#blank#}3{#/blank#}. Planting Leaders are very experienced volunteers. They are able to help other volunteers at planting events. Planting Leaders usually wear a special FUF T-shirt. Some new volunteers know little about "replacement trees". They can easily find Planting Leaders and {#blank#}4{#/blank#}.

When I was about ten, I was woken up by the shouts（喊声）of my sister one morning. She was hungry, but my mother wasn't at home, so I made a banana cake for her. Let me share the recipe with you.

What you need:

2 eggs  3 bananas  2 cups of flour(面粉)

2 spoons of baking powder(发酵粉)

1/4 spoon of baking soda (小苏打)

1/2 spoon of salt

2/3 cup of sugar

1/3 cup of vegetable oil(油)

What to do:

l  Mix(混合) together the flour, baking powder, baking soda and salt in a large bowl.

l  Add the vegetable oil. Then add a little sugar, and stir (搅拌) it.

l  Pour the eggs into the bowl and stir them well.

l  Add the bananas and stir them.

l  Turn the oven to 180℃.

l  Pour them into the oven（烤箱）. Bake（烘焙） the cake for 20 minutes.

l  Get the cake out of the oven, and cut it into pieces to eat.