500
                                I said good-(by / buy / bye) to my parents, walked (by / buy / bye) the old high school, and stopped at the grocery store to (by / buy / bye) some chocolate bars, marshmallows, and graham crackers.  
                                I said good-BYE to my parents, walked BY the old high school, and stopped at the grocery store to BUY some chocolate bars, marshmallows, and graham crackers.