* Dortmund drift 17 points away from leaders Bayern * Younes, 19, scores debut goal * Levekusen held 0-0 at bottom-placed Fuerth (Writes through after Leverkusen draw, adds quotes) BERLIN, Feb 24 (Reuters) - Champions Borussia Dortmund were toothless in a 1-1 draw at Borussia Moenchengladbach on Sunday, but still hung on to second place after rivals Bayer Leverkusen's goalless draw at bottom-placed Greuther Fuerth. Three days before their German Cup quarter-final against Bayern Munich, Champions League competitors Dortmund failed to make their superiority in possession and firepower count. ... More...