Many English adverbs end in which two letters?

Adult males of which animal are called silverbacks? 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? Advertising Age ranked the 1959 "Think Small" ads for which car the top campaign of the 20th century? ADW stands for assault with what? What were the aerial acrobatics popular in rural America after WWI called? Aerosmith covered "Come Together" in which 1978 movie starring Peter Frampton and the Bee Gees?