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.