1. Dance gives prisoners something to do, something they can be proud they're part of.
be proud of만 있으면 될듯한데 중간부분은 어찌과야 하나요? 삽입절이라기에도 이상하구요..
2. She had discovered the secret of which of two doors led to a lady.
which가 의문대명사인가요? secret바로 다음의 of이하 절이 명사절인가요?