将下面方框中的句子填入适当的位置，使对话完整。 A. How are you going to do that? B. Where are you going to take singing lessons? C. I want to be a singer. D. I'm going to start next week. E. Are you going to sing country music? A: What are you going to be when you leave school? B: ________ (1) A: ________ (2) B: No. I'm not. I'm going to sing rock music. A: ________ (3) B: I'm going to take singing lessons. A: When are you going to start? B: ________ (4) A: ________ (5) B: In New York.