Hand 1: QQ. Don't see any other hand he's capping with and then just calling down with a K high flop.

Hand 2: Difficult, but since he's so aggressive at the flop and even when a heart flush is possible, I'm guessing J9 of hearts.

Hand 3: I'm thinking he either hits something on the turn, or he has a monster and doesn't want to knock people out (A checkraise on the flop or the turn would be perfect for protecting). However, with two clubs on the flop, I'm not really sure why someone would want to slowplay a set. So I'm leaning towards him hitting on the turn, not wanting to risk it getting checked around and fearing both a club and a heart flush. I think 66 or 6x, if I have to choose one, I go for 66.