Misc: How many possible opening moves does white have at the start of a game of chess?

Questions

In 1875 Verney Cameron is first European to cross equatorial ---------- from sea to sea. ?

In 1914 Bolsheviks overthrew ---------- govt in St Petersburg. ?

In 1917 October Revolution overthrows ---------- Provisional Government. ?

In 1918 Goddard demonstrates tube-launched solid propellant---------- . ?

In 1976 "Gone With the Wind" is shown on---------- . ?