By Steve Keating TORONTO, Feb 6 (Reuters) - Kevin Garnett recorded a season-high 27 points as the Boston Celtics continued to prosper in the absence of Rajon Rondo by holding off the Toronto Raptors 99-95 to secure a fifth successive win on Wednesday. The Celtics, who were expected to fade from the post-season picture when Rondo went down with a season-ending knee injury, have instead gone on a storming run, with all five of their victories coming since the All-Star guard was hurt.