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    A long time ago，there was a craftsman．His name was Lu Ban. One day，he was at work on a mountain．A leaf cut his finger．He saw many sharp teeth on the leaf．"Could I make a{#blank#}1{#/blank#}with teeth like these? I could cut things with it {#blank#}2{#/blank#}，"he said to{#blank#}3{#/blank#}．Soon he made a saw. It was the first{#blank#}4{#/blank#}in the world．People are{#blank#}5{#/blank#}using this tool today．