One summer night Beethoven (贝多芬) took a walk in the suburbs (郊区) of Bonn. Suddenly he heard the notes from a piano. He stopped 1 carefully and found it was his F Sonata (奏鸣曲). He 2 the music and came to a small house. There 3 the window he saw a girl 4 a very old piano; a young 5 was making shoes beside her. He pushed the door 6 and went in. The man 7 him warmly and told him that the girl was his sister, 8 was blind but 9 music very much. They could not pay 10 music lessons. So she was 11 trying to play some music she heard 12 play. She knew it was the 13 of a great composer (作曲家). Beethoven was very much 14 . He could 15 restrain (克制) himself and said he would play some music for them. He played so 16 that the brother and sister were surprised. But 17 they had time to ask him to play 18 , Beethoven went 19 and wrote what he had just 20 . That was his famous Clair de Lune (《月光曲》).

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