not very good, but heres my answers anyways
1st one, prob fold it....
2nd one, villain 1 could have made a better low here but also a chance he paired up, if he has made a better low hes raising and were in a tough spot, so id make a call here and see what develops..
3rd one, he should have a pair here if he is raising a king in stud 8, i dont think you can raise, make the call and hope for a low card, even if i paired up here id be trying to take the lead in the betting, any 2 4 6 looks like a bad card to whatever the opponant has, looks like we hit a low and straight.
interested in finding out how you approached these situations..