Nellie: What a pinhead I was.
Nellie: Mother says older men are better for a girl than young men.
Lt. Cable: This has been a discouraging day for me.
Nellie: You know what I mean, Emile?
Emile de Becque: Yes. We're both knuckleheads - cockeyed optimists.
Emile de Becque: What makes her talk like that - you and she? I do not believe it is born in you! I do not believe it.
Lt. Cable: It's not born in you - it happens after you're born.
Emile de Becque: When all you care about is here, this is a good place to be.
Answer: See http://www.imdb.com/title/tt0052225/fullcredits#cast.Bloody Mary's singing voice is Muriel Smith, Lt. Cable's is Bill Lee. Mitzi Gaynor (Nellie) does her own singing. For most of these "on-location" musicals, the singing is recorded in a studio, so even the actors who do their own singing are, in effect, dubbed by themselves.
Myridon