Many objects(物体) that people use each day started with a simple idea. These objects have often ___1__ the way we live. Some help us to do a job more ___2___. Others help us to fill a need or ____3__ a problem.

   In 1858 Lipman had such an idea. One day he took ___4__ a pencil, a piece of paper, and an eraser. Then he began to write. Sometimes he __5___ to change a word. Each time he had to __6___ under his books and papers to find the eraser. “I wish my eraser would stay in one __7__!” he thought to himself.

   Then Lipman had his simple idea. He cut a ___8____ in one end of the pencil. He glued(粘) the eraser into this groove(沟槽). Later he thought that others might ___9___ to have such a pencil. So he sold his invention. Soon pencils ___10___ erasers came into use.

(  ) 1. A. shown      B. found     C. changed     D. pointed

(  ) 2. A. easily      B. clearly     C. luckily      D. carefully

(  ) 3. A. discuss      B. study      C. offer      D. solve

(  ) 4. A. back       B. out      C. away       D. off

(  ) 5. A. began      B. failed     C. refused      D. needed

(  ) 6. A. search      B. see      C. hide       D. move

(  ) 7. A. side       B. box      C. place       D. space

(  ) 8. A. hole       B. groove     C. mark      D. crossing

(  ) 9. A. agree       B. forget      C. like      D. mean

(  ) 10. A. with       B. without     C. or       D. and

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