[Lurker4]

hand 1: I probably bet this turn; you're unlikely to get raised and you'll probably have to call a bet if you check. At least if you bet, you have fold equity against the medium connectors/suited type hands that loose players will limp with and not call a bet on this board.

hand 2: I usually bet this turn after picking up my draw, for same reason as in hand 1, a T probably won't raise here but will bet if you check, so one bet goes in either way but if you bet you have fold equity. Once you check and the turn is bet, I still call, w/8 OESD outs + possible pair outs.

hand 3: I also tend to bet this, you have very good fold equity against undercards to the K, and can usually get something like A8 or A9 to fold. Once you check, I call the turn bet.

I usually bet turned draws in these situations, mainly b/c I hate just check/calling here barely getting good enough pot + implied odds to chase my draw. At least if you bet you have another way to win.