What is the hollow fitting that holds a light bulb called?

Complete the title of the Hitchcock thriller "The ___ Steps". What is a hoarse whistling sound produced while breathing called? A hockey game and each period begin with which play? An E.T.A. Hoffmann tale lost the words "and the Mouse King" from its title when it became which Tchaikovsky ballet? What is a hollow-nosed bullet that expands on impact called? "A Holly Jolly Christmas" and "Silver and Gold" came from which 1964 TV special featuring Burl Ives? A Hollywood venue was renovated and renamed the Aquarius Theater to host which musical in 1968? Which temple complex, the world's largest religious monument, appears on Cambodia's flag?