useless trivia: What Word Means: A High Church Tower - A Curl - A Sedge?

Questions

In 1955 First electric power generated from ---------- sold commercially. ?

In 1968 ---------- Corporation is incorporated. ?

In 1980---------- , first Indian satellite, is launched. ?

In 1984 Svetlana ---------- accompanies Vladimir Dzhanibekov on EVA outside Salyut 7, becoming first woman to walk in space. ?

In 1986 Videotapes released showing sunken remains of the---------- . ?