New Milford High School is set to reopen three classrooms damaged in a July roof fire.  The three science rooms directly below the blaze, which sustained the most damage, had been sequestered by the contractor by a temporary wall.  They could reopen by the end of the week.  About 50 classrooms sustained smoke and water damage, and the majority were opened before the pushed-back start to the school year.  School administrators moved things around so students could take science classes, and those who needed lab courses were set up with alternative courses.