Alexander Pope's 1711 essay in verse was "An Essay on" 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 wrote that "hope springs eternal in" 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? Alexander Wood and Charles Pravaz are credited with developing which device around 1853, first used to inject morphine?