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.
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No one knows how the huge rocks and ___ without our modern machines eight hundred years ago.
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A．are cut; moved |
B．were cut; move |
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C．are cut; moving |
D．were cut; moved |
—Susan’s parents have bought a large house with a swimming pool.
—It be very expensive.
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A．must |
B．can |
C．mustn’t |
D．can’t、 |
This picture is quite old, we can still see it was drawn in century.
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A．sixteen |
B．the sixteen |
C．sixteenth |
D．the sixteenth |
The place _______interested me most was the Children's Palace.
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A．Which |
B．where |
C．what |
D．in which |
Mr Yu gave some new words to Lucy and asked her to on the blackboard.
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A．write it down |
B．write them down |
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C．write down it |
D．write down them |
