Q14: you have to kill me Q15: bottom left answer Q16: Johnie Q17: DO'H Qerr..: wut? Q???: go to 20 secondQ???: took the cookie Q20: where's the music? Q21: I laik you!!!1!! that's it if combined with kamele's comment.
Super easy exp: get the FN SCAR. 150 bullets, 40 damage each, 15 bullets shot per second rate.
Even easier: bloodlust+overkill+FN SCAR= SUPER EASY EXP! :D