阅读下面的短文，根据每个空格中所给的词首字母填入适当的词，使短文意思完整。 On Easter, April 9th in 1939, more than 75,000 people came to the Lincoln Memorial (林肯纪念馆) in Washington, D.C. They heard the famous African-American singer Marian Anderson g a free open-air concert. Anderson had planned to sing at Washington's Constitution Hall (华盛顿宪法大厅), but a political organization that helped manage the concert hall refused her the right to perform because she was b . With the help o the first lady Eleanor Roosevelt, Anderson's performance at the Lincoln Memorial m people greatly aware (意识到) of the p of racial discrimination (种族歧视) in America. Anderson had tired hard out of a p childhood in South Philadelphia to become a world f singer. Even after her great appearance at the Lincoln Memorial in 1939, it was not u 1955 that she became the first African-American to be i to perform at New York's Metropolitan Opera House (纽约大都会歌剧院) Anderson died in Portland, Oregon, o April 8, 1993.