Paper is {#blank#}1{#/blank#} (到处). We use it for homework, money, books, letters and cards. We have paper {#blank#}2{#/blank#} （杯子）, paper bags, paper plates and so on. It was first made in China. The Chinese made the first {#blank#}3{#/blank#} （真正的） paper in the year AD 105. And the Chinese kept it as a secret for hundreds of years. By the end of the {#blank#}4{#/blank#} （十二）century, paper-making reached Europe. The first paper made in Europe was in Spain in 1151. Later people improved the way of producing paper again and again.

    Because paper is made from wood, many people are {#blank#}5{#/blank#} (担心)that more and more trees are cut down to produce paper. Trees are an important part of the environment. {#blank#}6{#/blank#} (因此)many paper factories are using old paper instead of {#blank#}7{#/blank#} (新的) wood to make paper. The way of using old products again is called recycling. Recycling paper helps {#blank#}8{#/blank#} (节省) a lot of trees every year. Many people also try to use {#blank#}9{#/blank#} （更少） paper in their lives. For example, they use both sides of every piece of paper instead of just one. They also use computersto store information. Perhaps one day in the {#blank#}10{#/blank#} (将来)people will not use paper to write at all.