根据对话内容，在每个标有题号的空白处填入一个适当的句子，使对话完整，合乎情景。
A: Hello, Lucy. May I ask you some questions?
B: Sure. What are they?
A: I hear you like collecting stamps.                                      
B: Since I was ten years old.
A:                                       
B: Because I can learn a lot of history and culture from them.
A:                                      
B: I have had 500 stamps.
A:                                         
B: I put them on my shelf.
A:                                       
B: Yes, my parents allow me to practice my hobbies as much as I want.
A: Thank you.
B: You’re welcome.