Task: Dialogue Generation
Input (English): F: Have you handed in your exercise book, Jack? ,M: I'm sorry, I haven't, Miss Smith. I have already finished the exercise, but I can't find my exercise book anywhere now.
(A) F: You can' t find your exercise book? Why? (B) F: Bob, why don' t you find your exercise book? (C) F: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (D) F: Joe, you are so careless, how can you leave it on the bus?
Output (English): A