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All that glitters is not gold.

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I was having a nap when suddenly the telephone rang.

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In no other country in the world can you find such plants as thi

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In an age of plenty, we feel spiritually hungry.

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Each time history repeats itself, the price goes up.

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The more passions we have, the more happiness we are likely to e

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Various substances differ widely in their magnetic （磁性的） charact

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This place has plentiful material resources.

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There is a large amount of energy wasted due to friction （摩擦）.

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The students are encouraged to do more listening, reading and wr

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