______have a particular feature, quality, etc. naturally 2.______a problem that delays or prevents progress, or makes things worse than they were 3.______think about sth. profoundly 4.______finally, in the end 5.______an important victory or success after a difficult struggle 6.______ certain to happen, unavoidable 7.______suddenly fall down or become unconscious because one is ill or weak 8.______someone who watches at a show, game, or other event 9.______walk in an unsteady way and often almost fall 10._____a very difficult, unpleasant, or frightening experience or situation