We live on the earth and depend on many kinds of natural resources. But these resources are very limited so we should try to save them. For example, in our daily life we should turn off the tap when we finish using water. Don't have the water running when we wash face or brush teeth. Besides ,we should make proper use of paper. We should write on both sides and we had better send our used books to the junior students. In that case we can save many trees.And then we should form a good habit of saving electricty . Remember to turn off lights when we leave. Don't turn on lights unless it is too dark. Finally we should ride bikes instead of by bus or by cars to save gas. I think only in that way can we have more natural resources for the future use.