Answer:
Police/fire fighters/ Ambulence helpers.
Superman, Supergirl, Batman, Batgirl
Explanation:
They share the quality of wanting to help people, without really needing anything to say thank you, because feeling good, like they saved a life, is good enough.
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Hi, This is actually one of my favorite novels! I prefer to work through this question with you-- it'll build your comprehension of the novel and its themes. I want you to consider the arc of their friendship-- how did it start? What was their relationship at first? What initially tied them together? Once we get through that starting point, we can trace how their friendship affected them.