Hand 1: Its pretty close. I think you can call this against some players.

Hand 2: I lead the turn, theres no reason to think he has a ten here (not that its impossible, but there nothing that makes it any more likely).

Hand 3: Bet the flop. If no one has a K or a draw you aren't getting value anyhow. As played, I raise the turn a little harder.

Hand 4: Thats how I play it.