1. Taxes are collected by the government.
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2. Small fish are eaten by big fish.
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3. The meaning of a smile is understood by everyone.
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4. War and Peace is written by Leo Tolstoy.
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5. The Pyramids in Egypt is visited by millions of tourists.
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6. New information about the universe is discovered by scientists in the 21 century.
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7. The letter is signed by Mr. Rice.
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8. The fax is sent by Ms. Owens.
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9. Adam is met at the airport by Mr. Berg.
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10. The homework is collected by the teacher.