补全对话，根据对话内容,从方框内的选项中选出能填入空白处的最佳选项，其中有两个为多余选项。

A. When shall we meet? B. Where shall we meet? C. This is Mark speaking. D. Do you have any plans? E. What about going to the bookstore? F. It is about five kilometres away. G. I want to buy an English dictionary.

A: Hello! May I speak to Mark, please?

B: Hello! Who's that?

A: Lucy speaking. What are you going to do this Saturday?

B: I have no idea. .

A: Yes. Shall we go to the bookstore?

B: Good idea. .

A: So do I.I also need one to help me learn English.

B: Is the bookstore far from here?

A: Not very far. .

B: How can we get there?

A: The No.6 bus can take us there.

B：.

A: Let's make it half past eight in the morning.

B: All right. See you then at the school gate.

A: See you.