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We know that trees are useful in our everyday life. They __1__ us many things, such as wood,  oxygen, rubber, medicines and many other things. They can __2__ tell us a lot about our climate. The   following are the reasons. If you __3__ a tree, you can see that it has many rings. Most trees grow one   new ring __4__ year. Because of the reason, we know __5__ a tree is. A tree over a hundred years old   means that it has more than a hundred __6__ . When the climate is dry or very cold, the trees do not  grow very much and their rings are usually __7__ . When it is wet and warm, the rings are much   thicker. If the rings are suddenly very thin or suddenly very thick, this means that the __8__ changed   suddenly. If we look at the rings on this tree, we can learn about the __9__ for a hundred years. We  can see __10__ our climate is changing today.
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