нужна по английскому. Replace the underlined word with a personal pronoun

1) She knows English very well. 2) The children play football in the yard. 3) A modern factory is a complex high-tech organism where you have to study constantly. 4) My colleagues and I enjoy meals, talk and share our impressions of the day. 5) Olga is a beautiful young woman of twenty-seven with blue eyes and a charming smile.