Ответ:

The first men ever to make a successful 1) "flight" were Orville and Wilbur Wright, the 2) "inventors" of the first working aeroplane. 3) "Development" of the plane took a long time, during which the brothers 4) "carefully" studied birds to see how they flew. They made 5) "detailed" calculations before starting 6) "construction" of their flying machine. When finally launched in 1903, the Wright brothers' 7) "creation" flew 120 feet before landing. 8) "Fortunately", aeroplanes have come a long way since then, but there is no doubt that we owe a lot to the Wright brothers.