useless trivia: What Word Means: A Sofa - The Seat Of A King?

Questions

In 1977 Soyuz ---------- is launched.?

In 1838 A London pedestrian walks 20 miles backward and 20 miles forward in ---------- hours.?

In 1977 Soyuz ---------- returns to Earth.?

In 1922 U.S. Supreme Court unanimously upheld the ---------- Amendment (woman's right to vote).?

In 1983 The ---------- episode of TV show "M-a-s-h."?