题目内容：

根据对话内容，从方框内选出能填入空白处的最佳选项，其中有两项为多余项。

A: Hi, David.    1.   

B: It’s 5:00.

A: The class will be over soon.     2.   

B: I’ll go to the English Club. And you?

A:     3.   

B: Is swimming your favorite sport?

A: Yes, I like it best.

B:     4.   

A: Because it keeps my heart and lungs healthy.

B: I think so.    5.   

A: Certainly. I’ll call you if I go.