Which 1889 Mark Twain novel sends a 19th-century American back in time to Camelot?

What phrase means a robbery at gunpoint or an adhesive air freshener? A rock called peridotite produces which hardest of gems? Which group recorded "How Deep Is Your Love"? A relationship with exotic dancer Fanne Foxe ended which powerful congressman's career in 1974? What word names a roll of fabric or an arrow from a crossbow? What word names a roll or bundle of something, especially cash? Which Catholic school name, honoring the founder of the Brothers of the Christian Schools, means "the room" in French? What word names a Roman official or a Chicago newspaper?