Over 500 years ago,1.______ man designed 2.______ flying machine.3.______ clever man was 4.______ Italian.He was called Leonardo da Vinci.In 5.______ 1480,Leonardo da Vinci wrote to the ruler of 6.______ Milan (米兰) to ask for work.He said he was 7.______ good painter and 8.______ sculptor.He also designed bridges.He made weapons,too.He even invented machine guns.Eventually he got 9.______ job in Milan as 10.______ musician.He was good at everything he tried.We remember him today,however,as 11.______ artist.He is one of 12.______ greatest artists in 13.______ world.You may have heard of 14.______ picture called Mona Lisa (《蒙娜丽莎》).He painted that.While he was in Milan,he painted 15.______ special picture.He drew it on the wall of a monastery (修道院) dining room.Many people said that this picture was 16.______ greatest one ever painted.It’s called the Last Supper (《最后的晚餐》).Leonardo worked hard at painting 17.______ pictures.Often he worked all day and never stopped to eat or drink.He walked about 18.______ city of Milan with 19.______ notebook in his hand.He drew pictures of people in the street.He also watched 20.______ way birds and insects flew.He wanted to know how everything worked.