A：Hello！May I speak to David，please？
B：Hello!（51） ______ Who's that？
A：Peter speaking．What are you going to do this Saturday？
B：I have no idea．（52） ______ A：Yes．Shall we go to the zoo？
B：Good idea．（53） ______ Among them，I like pandas best．
A：So do I．I can't wait to see the pandas．
B：Is the zoo far from here？
A：Not very far．（54） ______ B：How can we get there？
A：The No.8bus can take us there．
B：（55） ______ A：Let's make it half past eight in the morning．
B：All right．See you then at the school gate．
A：See you．

A．Do have any plans？ B．We can see various kinds of animals there． C．Where shall we meet？ D．It is about five kilometers away． E．When shall we meet？ F．This is David speaking． G．What about going to the zoo？