A：Would you like to have dinner with me this evening, Bob? 

B：  . Maybe another time.

A：What are you doing?

B：I'm making aplan

A：What plan? Is it very important?

B：Yes, I always do volunteer work on the first Saturday of every month.

A：

B：I help out at the children's hospital. I help to plan some activities.

A：

B：Of course. You should help to make the sick children happy.

A： I can tell them some interesting stories.

a. Oh, I'd love to do that.

b. I must finish it on time.

c. Sorry, I can't. I'm busy.

d. Err…Bob, could I join you?

 e. What kind of volunteer work do you do？