Hand 1: I would not raise the river after MP has shown so much strenght on the turn. Good fold.

Hand 2: In my experience, unless CO is extremely passive, this kind of open limps on the CO or button many times mean a slowplayed monster hand. Therefore I would not raise preflop and just throw it away on the flop.

Hand 3: I think the river is the toughest part. Against some opponents I would check-call hoping to induce a bluff, other times I might bet or check-fold.