For thousand of years men couldn’t fly. It was 1. ______ too difficult. Birds are able to fly on their 2. ______ wings. It is very easy of them to fly. 3. ______ But men haven’t got wings. The first planes 4. ______ were gliders — planes without engine. 5. ______ The first plane with a engine was the Flyer. 6. ______ Two brothers, Wilbur and Orville Wright, building 7. ______ it. In December 17th, 1903, Orville lay on the bottom wing 8. ______ of his plane and start the engine. 9. ______ The Flyer was able take off and rose 10 feet and flew 120 10. ______ feet. This was a great moment in the history of flying.