Cary Grant and Kevin Kline both played which American songwriter on film?

Complete the title of Carson McCullers's 1940 debut novel: "The Heart Is a Lonely ___." Which French explorer named Mount Royal, site of today's Montreal, in 1535? Carthage was founded as a colony of which ancient seafaring people? On "South Park," Eric Cartman insists he isn't fat, just what? Cary Grant admires Grace Kelly's diamonds in which 1955 Hitchcock caper? Cary Grant co-starred with Audrey Hepburn in which romantic 1963 thriller? Which 1959 Hitchcock thriller sends Cary Grant on a cross-country chase that ends at Mount Rushmore? Cary Grant's wife Betsy Drake survived the 1956 sinking of which Italian ocean liner?