题目内容：

交际运用

IX. 根据对话内容，用方框内所给的选项补全对话, 其中有一项是多余的。

A: Hi, Molly! 1._______________

B: Oh, Dave! I like dogs best.

A: I like dogs, too. 2._______________ 

B: Because they are interesting. 3._______________ 

A: Yes. 4.__________________ It is very interesting to play with them.

B: They can help us a lot.

A: Yes. Do you have a pet dog?

B: Yes. Its name is Luke. 5.________________

A: I don’t have one now, but my mother says she will buy one for me.

B: Sounds great!