*grunching*

Hand 1: Preflop is marginal but not too bad. Check-raising is fine, but I think you could cap the flop and then lead the turn.

Hand 2: Bet the river.

Hand 3: I think you could fold this flop with two overcards to your pair and a small 1-card flush draw.

Hand 4: Raise preflop. I like postflop play all the way. When the BB wakes up on the river it looks like a straight, but I would pay off anyway.