[Burrito]

Hand 1:
Fold, we are behind his range.

Hand 2:
Call. Flop a set, make a bet! Miss a set, fold without regret.

Hand 3:
Re-raise. You are well ahead of his range, and you should:
a.) Get money into the pot with the probable best hand
b.) Take control of the hand.

If you just call, then you'll be folding to his c-bet 2/3 of the time. If you re-raise, you either take it there, or almost always take it on the flop.

Hand 4:
Re-raise. Same thing as above, although I could definitely see a case for folding.