根据对话内容，从文后的选项中选出能填入空白处的最佳选项，其中有两个为多余选项。
A: Jim, are you interested in working as a volunteer (志愿者)?
B: Of course, Linda. I have been doing a lot of volunteer work.
A: 【小题1】
B: I taught some children English in the countryside. Their parents are working in big cities.
A: What do you think of this work?
B: 【小题2】 I really enjoy it.
A: Do you have other plans for your future volunteer work?
B: I am a medical student. 【小题3】
A: Really? It sounds like a great plan.
B: Yes. 【小题4】
A: A person like you is a hero. 【小题5】
B: Thank you! I will continue to help more people.

A．It is meaningful.

B．We should learn from you.

C．The volunteer work is difficult to finish.

D．What kind of volunteer work have you done?

E．What do you really want to do as a volunteer?

F．I believe the happiness comes from helping others.

G．I want to be a doctor in Africa and help patients there.