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____________ have been exploring space for decades, learning more about the universe.

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My cousin, ___________ lives in Australia, is coming to visit us next month.

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Mercury is the ____________ planet in our Solar System.

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____________ is essential for life and is the most common liquid on Earth.

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Venus is often called Earth's sister planet because of their similar ____________.

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Astronauts travel to ____________ to conduct scientific experiments and explore the universe.

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The ____________ includes the Sun and the planets orbiting around it.

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____________ is the only planet known to support life in our Solar System.