In hand 1, you were correct to call because 1: the raiser was in 4th position... in that position it is more likely they have 2 high cards than a high pair ... since in over half the cases you are a slight favorite and in under half your are a big dog, you are correct to call with 3:1 odds.
2: you were the BB which gave you the odds to call.
Had the raiser been UTG this call would have been a little suspect, but not absolutely horrible. You also must be good after the flop to make this call ... if you see more than 1 card T or higher on the flop you must fold if you don't flop the set.
In hand 2, you were horribly, horribly wrong to call the preflop raise. A big difference here is you were cold calling 2 bets with no other callers. When you play a small pocket pair, you are hoping to flop a set and get paid off for it. You will flop a set a little under 12% of the time. You can expect a set to hold up and win a little over 80% of the time. This gives you at best, about a 10% win rate with your set. What this means is that you must expect to win a pot on average 10x your preflop investment when you do win with a low pp. When you are in late position and can call 1 bet with 4 limpers, this is great odds ... you can expect 6 more SB in the pot by the end of the hand. To call this hand to a raise in EP is very bad because now you need to win a pot of 20SB on average and you don't know if anyone else will stay in or not or if they might raise. It takes a special table full of fish to even think about this call.
Hand 3: This is a completely different scenario. You have a near premium hand with the tens, 2 players have limped, the raiser was in late position and you are the small blind. This is a call/raise situation. If you think you can isolate the raiser, you should reraise, as the odds are better than even he has 2 high cards and not a bigger pp. If the 2 limpers are likely to call a reraise, I would just call ... remember that you will be out of position the rest of the hand.