Hand 1 - I like calling the flop since it's so dry. I have no idea what villain would have here. Some Jx hand? Maybe a poorly played QQ-AA

Hand 2 - You got paid here

Hand 3 - I like a fold on the river

Hand 4 - bleh, check/call a reasonable river. Flop bet could be a little bigger

Hand 5 - If you're going to donk bet, bet more. However I think it's a bad play. Pre-flop Raiser is on your right, so if he puts in a raise it'll blow everyone else out of the pot. If he bets and gets a caller or two you can raise and trap dead money in the pot