根据对话内容与上下文,在空白处填入适当的句子,使对话意思完整。 A: Hello, may I speak to David? B: _________________________________________.(1) A: Hi, David! This is Lin Tao speaking. B: Hi, Lin Tao. What's up? A: What are you going to do next Sunday? B: _________________________________________.(2) Do you have any ideas? A: Shall we go to the zoo? I hear there's a dolphin show there. B: A dolphin show? Good idea! _____________________________________?(3) A: By bike. B: _____________________________________________________________? (4) A: At half past nine. B: _____________________________________________________________? (5) A: Let's meet outside the zoo gate. B: All right. See you then.