Adult males of which animal are called silverbacks?

Adrian Zmed returns to Rydell High with Didi Conn in the 1982 sequel to which film? Ads for the 1998 remake of which 1960 film said "Check in. Relax. Take a shower."? Ads for which 1939 film said "Garbo laughs!"? Ads for which blue-eyed star's 1994 film "Nobody's Fool" said "He's worn to perfection"? Which high-altitude spy plane flown for the CIA was shot down over the USSR on May 1, 1960? "Tom Terrific" and his dog Mighty Manfred first aired in 1957 on which Bob Keeshan series? Which adverb was used as a Hertz slogan? Many English adverbs end in which two letters?