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.