Many objects that people use each day started with a simple idea. These objects have often changed the way we  46 . Some help us to do a job more   47 . Others fill a need or solve a problem.

In 1858, Lipman had such an  48 . He took out a pencil, a piece of paper,   49 an eraser. Then he began to write. Sometimes he needed to  50  a word. Each time he had to search under his books and papers to   51  the eraser. “ I wish my eraser would stay in one 52 !” he said.

Then Lipman had his simple idea. He   53  a groove(凹槽) in one end of the pencil. He glued(粘牢) the eraser into the groove. Lipman had solved his problem. Later he thought that others might like to have such a pencil. So he sold his  54 .Some pencils with erasers were 55 . His design earned $ 100000.

Many objects that people use each day started with a simple idea. These objects have often changed the way we  46 . Some help us to do a job more   47 . Others fill a need or solve a problem.
In 1858, Lipman had such an  48 . He took out a pencil, a piece of paper,   49 an eraser. Then he began to write. Sometimes he needed to  50  a word. Each time he had to search under his books and papers to   51  the eraser. “ I wish my eraser would stay in one 52 !” he said.
Then Lipman had his simple idea. He   53  a groove(凹槽) in one end of the pencil. He glued(粘牢) the eraser into the groove. Lipman had solved his problem. Later he thought that others might like to have such a pencil. So he sold his  54 .Some pencils with erasers were 55 . His design earned $ 100000.