hand 1 meh 7 is a terribad card because he has a 7 all day when he checks the flop back
hand 2 is sweet when you think the guy is squeezing light some of the time and I think it's mandatory vs. people who are at all aggressive in squeeze spots
if you had TT you could probably flat again
hand 3 never squeeze/fold with jacks, you're only doing this to get it in, button has a small pp or crap because he'd 3b a good hand and the 1% chance he has QQ is just a sick cooler