The clue for the first blank is in ..the very ideas that made him famous, so the blank should be something that contrasts with Wilson's previous position. Hence, repudiates is the best option. The second blank should be something that affected both Wilson's proponents and detractors, hence astonishment is the best choice. Because it took both his critics and followers as a surprise that he changed his initial position. The third blank should suggest a word that discarded his previous position, therefore, have crumbled is the only choice that fits.