从方框中的七个选项中选出五个合适的句子补全对话。

A. with      B. Why      C. When      D. voluntary     E. have       F. Who

A: Alice what do you often do in yourfree time?

B: I do some  work in a children's hospital.

A: do you do it?

B: Because I want to help people who need help.

A: May I join you?

B: Of course. We will an activity this Friday afternoon,and you can go me.

A: shall we meet?

B: At 4 pm.

A: Oh, I see.