1) millions a) force that makes things fall down b) a very large number c) people who travel space 2) astronaut a) force that makes things fall down b) a very large number c) people who travel space 3) a very large number a) millions b) astronaut c) gravity 4) force that makes things fall down a) gravity b) millions c) astronaut 5) gravity a) force that makes things fall down b) a very large number c) people who travel space 6) people who travel space a) millions b) astronaut c) gravity

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