Hand 1 is fine. He's not taking a free card from you anyway.
Hand 2 I can find a rare laydown here as I think CO has you crushed and once in a while MP3 has you beat. The union of the two might get me to fold depending on how crazy the game has been playing.
Hand 3: Fold pre-flop, bet the flop against most opponents, after that it's fine. Once you turn gin you want all the money in the pot.