Choose the best expression for each blank from the list of choices given in the box. (没有变形,务必填写单词前的字母序号) Before airplanes and 1) ________ were invented, flight was only a dream for little Wright Brothers, who were brought up in a loving and warm family that 2) ________ learning and doing. Their father, Milton Wright, often 3) ________ them to the world beyond their horizons by 4) ________ gifts, one of which 5) ________ the brothers for their whole lives; that was a rubber band-powered helicopter. They were holding and pursuing the dream of flying since then. In the late 1890s, the two full-time businessmen, who sold bicycles, began to work on a simple system to twist the 6) ________ of a biplane. The first test flight at Kitty Hawk, North Carolina, where the natural conditions were prefect, 7) ________. They 8) ________, however, fulfilled their dream on December 17th, 1903 when the first airplane lasted 12 9) ________, 10) ________ the birth of“the fathers of the airplane” and the age of flight.