2) if we check, the best play is to fold to his 25. Betting the turn is good, but if called, i think we'll be firing just about any river
3) looks like a spade draw or a pp 99-QQ. Best standard play with given info is to call turn,
-check behind a 7 or a 9 river, -maybe call a bet on a 7 or 9 river given a specific read based in part on the bet size, -raise a bet on a non spade T or a 5, -call a bet on spade T or a 5, -raise a bet on any other non spade river.
folding turn doesn't sound bad either but the above is probably more +EV, and much better in meta-game value