Misc: Chewing gum was patented by who?

Questions

In 1921 ---------- gains independence from China (National Day). ?

In 1921 Mongolia gains independence from ---------- (National Day). ?

In 1937 George ---------- composer (American in Paris), dies at 38. ?

In 1937 George Gershwin composer (American in Paris), dies at ------------ ?

In 1945 Deborah ---------- singer (Blondie) actress (Videodrome, Hairspray), born. ?