补全对话。 A: Let's go. B: I'm going out to buy a birthday cake for my mother. C: I want to buy a sweater for myself. D: Why are you here? E: What would you like to buy? (Outside the door of a supermarket, Danny met LiMing) D: Hello, Li Ming, glad to see you. L: Me too. 1 ? D: 2 , tomorrow is her birthday. L: Happy birthday to your mother. D: Thank you. 3 ? L: 4 D: Would you mind going together? L: Never. 5 1. _____ 2. _____ 3. _____ 4. _____ 5. _____