Elected by the Council of Pisa in 1409, Alexander V is now regarded by the Catholic Church as what?

Alexander Pope wrote that "hope springs eternal in" what? 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 ___". Alexander Wood and Charles Pravaz are credited with developing which device around 1853, first used to inject morphine? Alexei Tolstoy, a relative of Leo, wrote plays in 1942 and 1943 about which harsh czar? Alexei Yagudin, Todd Eldredge and Elvis Stojko all competed in which sport? Alexine Tinne's 1869 attempt to cross which desert ended when she was killed by her Tuareg guides?