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It is known to us how he became a writer.
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It is known to us all that water is the source of life. .
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It is known to us all that the computer is the most important invention in the 20th century.
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As is known to us, knowledge is power.
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As it is known to us all, reading has a great impact on our whole life.
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As is known to us, heavy smoking ruins our health.
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