(Numbering your pictures would make feedback easier.)
I like #1 and #7 best because of the various facial expressions. In #1, nobody looks like they want to be there. In #7, I'd move they guy to the right of the image.
#2-6, the subjects are having a tendency to disappear into the background. I think #4 would work better, though, if you zoomed in on the two guys at the center of the action.
#8, no clue what's going on.
All of them seem dark. Maybe a limit to your equipment and the conditions, but I think they'd all be better if they were a bit brighter.