情境交际，从方框内选择正确的句子补全对话，其中有两项是多余的。 （10分，每小题2分）

A: Good morning!      1    
B: Fine, thank you!.
A:  __   2 _   __
B: It is a book.
A: Is it a Chinese book?
B: No, it isn’t. _    3 _____.
A: Is it yours?
B:      4 ____.
A:   Whose is it? Is it Tim’s?
B: No, his is green. __   5 ____.
A: OK. Let’s give it to our teacher.