Hand 1: lead flop, make it look like a c-bet that doesn't have a K.
Hand 2: I know he has you beat, but he's asking you to put in another $20 and you haven't put in much more than $10 thus far. You can find a fold here just by checking out those numbers. Also, there are a lot of hands that beat you here, remember you have represented a big PP to this point... why would he want to put his whole stack in against a big PP?

Hand 3: Sometimes, no one has a good hand.