Alexander Pope wrote that "hope springs eternal in" what?

Alexander Khalifman, Anatoly Karpov and Garry Kasparov have all been world champions at what? Complete the title of Alexander McCall Smith's 1998 novel: "The No. 1 ___' Detective Agency". Which early plastic did Alexander Parkes develop in the 1850s? Complete Alexander Pope's line: "For fools rush in where angels ___." Alexander Pope's 1711 essay in verse was "An Essay on" what? Alexander Popov became the first man to win the Olympic 100-meter freestyle twice since which 1920s swimmer? Complete the title of Alexander Solzhenitsyn's novel: "One Day in the Life of ___". Elected by the Council of Pisa in 1409, Alexander V is now regarded by the Catholic Church as what?