英语问答求速解在下列横线上填入适当的句子,补全对话.A：Hello,Michael.This is Kangkang s

英语问答求速解
在下列横线上填入适当的句子,补全对话.
A：Hello,Michael.This is Kangkang speaking.21._____________________
B：I’d love to,but I’m afraid I’ll have to go to the library.
A：22._____________________
B：I think I’ll be free next Saturday.Let’s go hiking then.
A：23._____________________
B：Let’s make it half past six.
A：24._____________________
B：At the school gate.
A：OK,25._____________________
B：See you.