I think it's going to say like how the characters are feeling right now and how they talking like for example when your angry you talk
in a angry voice and
Dont add comma is the right one
A, The river is constantly changing. I did this last year so I know what the answer is. Fickle means changing frequently or in my term, stubborn. In his point of view, the river has a mind of its own and changes often. Which he described as "fickle." It may be hard for Twain to pilot a steamboat, if the river is constantly changing.
