NL25$ TAG or TAP on the flop

[Bauertson]

Hello, I play on PartyPoker the NL25$. My question is about the style for playing on the flop. I have 67h in late position, and 4 player's are in the play. The 3. Player make a half-pot-size-bet, what are you play (raise, call or fold) with the follow flops:
A) Flop 5h, 8h, Kd (straight-flush-draw)
B) Flop 5h, 8d, Kc (Straight-drawn)
C) Flop Ah, Th, 2d (Flush-Draw)

I'm sorry for my english, but I hope you understand my question ;-)