(1) Both Jerry and his sister......this is plural because it is more then 1. (2) Several ...talking about more then 1....so its plural (3) The deer....this could be singular or plural...however, when u read further, it later says " the same place THEY had come out....so it is plural. (4) Any (of those ideas).....Any (ONE) of those ideas....singular
rather tall and muscular, with blond hair that came down over his shoulders and a square jaw. He had a limp from his attempted of tring to kill himself, during which he climbed one of the walls in the Maze and leaped off it.