BATH TWP.: Dancer Demarco Sleeper thought he might never be able to participate in his passion again when a car accident took the use of his legs five years ago.The 22-year-old Cleveland choreographer had broken his back and was sure his dancing days were behind him.“Once I was hurt, I didn’t feel I’d be able to dance again,” he told an audience of fourth- and fifth-graders and some preschoolers Wednesday afternoon at Revere’s Bath Elementary School.