短文填空 （共5小题；每小题1分，满分5分） By the time he was 14, Mozart had 小题1: many pieces for the harpsichord, piano and violin, as well as for orchestras. While he was still a 小题2: , Mozart was already a big star and 小题3: Europe giving concerts. Haydn met Mozart in 1781 and was very 小题4: with him. “He is the greatest composer the world has known,” he said. The two were friends until Mozart’s 小题5: in 1791.