【题目】在方框中找出适当的句子，补全对话。A: Hello, Michael. This is Kangkang speaking.
B: I'd love to, but I'm afraid I'll have to go to the library.
B: I think I'll be free next Saturday. Let's go hiking then.
B: Let's make it half past six.
B: At the school gate.
B: See you.
A. When shall we meet?