For many ____ people thought, humans could fly ____ the birds. The famous ____ Leonardo da Vinci ____ this when he studied flight. He ____ machines with ____ that go up and down.Brothers Montgolfier made the first ____. Englishman Cayley designed gliders. One of them had a boat and ____. In 1903 the first plane travelled in the air. It had ____ and needed ____.

History of Flight 2

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