根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。

A: Hi, Jack!  

B: Hi, Tim! I'm working on a program for the TV station.

A: Cool!  

B: It's a program to help a family. A family lost their house in the earthquake.

A:  

B: Yeah, it is. So we're going to build a new house for them.

A:  

B: Members of a club will help. And a group of students will help, too.

A: That's great.

B: Yes! The program will start next Saturday.

A: I want to volunteer.  

B: Bring any tool you have. And wear old clothes! You're going to get dirty.

A. That's terrible. B. What were you doing at that time? C. Who else will help? D. What kind of program is it? E. What are you working on? F. What should I bring? G. That's for sure.