1. (2022九上·肇东期末) 根据对话内容，用适当的短语或句子将对话补充完整

A: Hello, Tony. Why are you in such a hurry? ?

B: I lost my backpack. I remembered putting it under a tree beside the playground.

A: Really? ?

B: An hour ago. I was playing soccer on the playground. It was gone after that.

A: Bad luck! ?

B: There are some books and a wallet.

A: Don't worry. Maybe someone took it by mistake.

B: ?

A: You'd better go to Lost and Found for help.

B: Good idea. ?

A: It's just on the second floor in the office building. Perhaps you are lucky to find your backpack there.

B: I hope so.