What is the fastest?
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1. Some __________ planes can fly more than 483 kilometers per hour (300 miles per hour).
propeller (revolving shaft)
2. To escape Earth's _________ and travel into space, a rocket ship must go faster than any jet.
gravity (The force that attracts a body towards the center of the earth)
3. Sometimes speeds are hard to _______.
measure (ascertain the size, amount, or degree of something)
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