20.An accomplished saxophonist (and composer), John Coltrane( begun) his (career playing )in the big bands of (the early) 1950's.
25.( Addressing )themes that were( unique )American, the poet Walt Whitman( celebrated) the lives of (ordinary people).
32.The Atlantic cable, which began (to operating) in 1866,linked the United States to London and to (another) cable (stretching) eastward to India and (beyond).