UnScramble this Word: e s t k t e l?

Questions

In 1950 The United Nations gets approval from the U.S. government for issuing ---------- stamps. ?

In 1982 Fifth Space Shuttle Mission - ---------- 5 returns to Earth. ?

In 1984 Fourteenth Space Shuttle Mission - ---------- 2 returns to Earth. ?

In 1558 Elizabeth I ascends English throne upon death of Queen---------- . ?

In 1869 The ---------- Canal opens. ?