Since 2009, which language has been Greenland's sole official language?

Which Muse of dance gives her name to an adjective meaning "relating to dancing"? The Grenadines island chain is divided between St. Vincent and the Grenadines and which other nation? Which 1985 power ballad was REO Speedwagon's second No. 1 hit? Which gentle "sea cow" is Florida's official state marine mammal? Which planet has no movement in Gustav Holst's orchestral suite "The Planets"? Which sitcom that debuted in 1988 starred Candice Bergen as a TV newsmagazine anchor? Which Four Seasons song, powered by Frankie Valli's falsetto, hit No. 1 in September 1962? Besides Luxury Tax, which square on the classic Monopoly board makes you pay a tax?