The article consists of three stories about (1)________ . The first story is about a (2)________ named Wan Hu, who made an unsuccessful attempt at (3)________ in A.D.1500. He built a spaceship powered by 47 rockets using (4)________. His idea was (5)________, but his dream of flight (6)________ 500 years later when China successfully launched its first manned Shenzhou V spaceship. The second one is about the Spruce Goose, a (7)________ designed to meet the need of (8)________ troops and materials during World War II. It was made entirely of (9)________ and still holds the record for (10)________ . Although it was (11)________ put to use, many of its design features have been incorporated into today’s (12)________ . The last is about Leonardo da Vinci, the most famous artist of the Renaissance. Apart from his great artistic work, he also drew sketches of (13)________ with flapping wings controlled and steered by (14)________ . (15)________ years later, a professional parachutist made a successful jump using a wood and canvas parachute based on one of (16)________ .