用动词填空。

     Tomas Edison 1_____ a great inventor. He 2_____ many things. It 3_____ said he invented 10000

inventions. But when he 4_____ old. He was too proud that he didn't 5_____ any one advice, even they

were right. Then he didn't have an important invention in his old age.

把5米长的钢筋，锯成每段一样长的小段，共锯6次，每段占全长的（    ），每段长（   ）米。如果锯成两段需2分钟，锯成6段共需（    ）分钟。