Misc: In 1955 First oil drill ---------- rig placed in service.?

Questions

In 1902 Charles A.---------- , 'Lucky Lindy', born.?

In 1932 First Winter Olympics held at---------- , NY.?

In 1936 First ---------- substance produced synthetically (radium E).?

In 1945 Roosevelt, ---------- , and Stalin began a conference at Yalta.?

In 1945 Roosevelt, Churchill, and ---------- began a conference at Yalta.?