根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯、完整。
A: Hello, Tony. Why are you in such a hurry? 1 .
B: I lost my backpack .I remembered putting it under a tree beside the playground.
A: Rreally? 2 .
B: An hour ago.I was playing soccer on the playground. It was gone after that.
A: Bad luck! Is there anything important in your backpack?
B: Yes. 3 .
A: Don't worry.Maybe someone took it by mistake.
B: 4 ?
A:You'd better go to Lost and Found for help.
B: Good idea. 5 ?
A: It's just on the second floor in the office building.Perhaps you are lucky to find it there.
B: I hope so.
1. ___________________________________________.
2. ___________________________________________.
3. ___________________________________________.
4. ___________________________________________?
5. ___________________________________________?
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