You may know the song Happy Birthday very well, but do you know about its writer? It___________(write) by an American girl. And she has become a very rich woman. When she was a child , she was poor. Once she was invited to her friends’ birthday party. She had no money__________( buy) presents for them. She was sad. Her mother said “__(not worry). How about _______(sing) a song together? Happy birthday to…” She decided to write it down and _____(sing) it to her friends at the party. They sang and sang “We________(not hear) such a song before.” The party ended up singing a song. Later the girl became well known in America.