When scare cards hit, why not check the river? It almost seems like old saying of "the only ones who call or raise are the ones who beat you"...

Also, it seems you called based on reads and also being pot committed... no bets on the river (unless these are blocking bets) may make the decision easier.

With that, I like hand #1 and hand #3 I fold (any 4 or 8 beats you and both of those are staying in on the flop) and #2 is a tough call... but call me tight I'm probably checking the river and and basing my actions on the opponent