In junior high school in America, kids study English, writing, math, science, biology, music and art．

　　At 12 o’clock, the students eat lunch at school．They have meat, vegetables, fruit, bread and a drink, but they like hot dogs and hamburgers best．American kids like sugar(糖), and after the meal they can have a small piece of cake．

　　Students sleep(睡觉)for a short time after lunch．They begin classes at 1∶30 in the afternoon．They go to school on weekdays and have classes for six hours every day and then return home．

　　Parents let their kids play or watch TV until dinner at 6∶00 p．m．After dinner, they do their homework．Sometimes kids and their parents have a family activity after dinner．

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Many objects that people use each day started with a simple idea.These objects have often changed the way we 1 ndline.Some help us to do a iob more 2 ndline.Others fill a need or solve a problem.

　　In 1858 H.L.Lipman had such an 3 ndline.He took out a pencil,a piece of paper,4 an eraser.Then he began to write.Sometimes he needed to 5 a word.Each time he had to search under his books and papers to 6 the eraser."I wish my eraser would stay in one 7 ndline!"he said.

　　Then Lipman had his simple idea.He 8 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 9 ndline.Some pencils with erasers were 10 ndline.His design earned him$100.000.

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