Hand 1-

Flop call is fine, but what purpose does calling the turn have? I'd probably just fold this on the turn instead of putting in more money when I'm behind quite a few hands now.

Hand 2-

I gotta say this is standard. He could have slowplayed a flopped straight or set especially since you classify him as passive, but I think you can expect to be ahead here fairly often.

Hand 3-

I don't think you can just fold it straight away on the flop, I'd probably throw out a turn bet tho tbh since I think you can rep the flush here. If he calls/raises that just shut down.