The answer for sure is the first two
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Cellphones can allow you to do better in school, and are a good way to communicate with teachers.
Answer:
The basic reason why the planets revolve around, or orbit, the Sun, is that the gravity of the Sun keeps them in their orbits. Just as the Moon orbits the Earth because of the pull of Earth's gravity, the Earth orbits the Sun because of the pull of the Sun's gravity.
Explanation:
Hope this helps!