选择恰当的句子,补全对话。 A. I'm going to be a writer. B. In New York. C. I'm going to take writing lessons. D. No, I'm not. I'm going to sing rock music. E. When are you going to start? F. I want to be a singer. A: What are you going to be when you leave school? B: 1_____ A: Are you going to sing country music? B: 2_____ A: 3_____ B: I'm going to take singing lessons. A: 4_____ B: I'm going to start next week. A: Where are you going to take singing lessons? B: 5_____