I pass four and five because my overcard is visible, so I have less chance of making money if I hit it. I'll play the one with the gutshot because it looks like it will be a big pot. The last one I play because the pot is a bit bigger, and I have some straight potential. The first two are the sort that 7CSFAP suggests too many people fold. In both cases, if you catch on fifth you have a nice hand.