阅读下面的对话，然后根据对话内容补全句子
Peter: Can I come in, Alice?
Alice: Yes, please.
Peter: Is this your pen?
Alice: Yes, it is. What’s that(那个) on the desk?
Peter: It’s a book
Alice: Is it your book?
Peter: No, it’s Zhang Hai’s.
Alice: Who(谁) is Zhang Hai?
Peter: He is my classmate.
Alice: I see. How about your book?
Peter: It’s in my bag. What’s this in English?
Alice: It’s a ruler.
Peter: Thank you. Goodbye.
Alice: Goodbye.
The p____________ is Alice’s.
Zhang Hai’s book is on the______________.
Zhang Hai is Peter’s________________.
_____________ book is in his bag.
划线部分句子的意思是：
___________________________________________