UnScramble this Word: s e p k o r?

Questions

In 1975 Papua ---------- gains independence from Australia (National Day). ?

In 1976 ---------- Church approves ordination of women as priests and bishop. ?

In 1977 ---------- Callas American-born prima donna dies in Paris at 53. ?

In 1977 Maria ---------- American-born prima donna dies in Paris at 53. ?

In 1977 Maria Callas American-born prima donna dies in Paris at---------- . ?