Change the Active to Passive, remember to use “by”
1. Nine planets orbit the sun.
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2. Clyde Tom-Baugh discovered Pluto in 1930.
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3. Christian Huyghens first saw Saturn’s rings in 1655.
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4. William Herschel identified Uranus on March 13, 1781.
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5. Moons orbit some planets.
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6. Galileo discovered the four largest moons.
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7. Two moons orbit Uranus.
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8. A heavy atmosphere covers the planet Venus.
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sábado, 6 de febrero de 2010
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