First hand is nasty being 3-way. Someone almost certainly hit their flush here, so its a question of trying to get to the river as cheaply as possible to see if you can hit your 10 outter. Without reads its tough. If they're unlikely to raise, then b/f is good. If you think they'll slowplay or bet small to 'get value', then c/c. Against unknowns I probably check and evaluate based on the size of any bet. If its too much you just need to fold.

I dont mind the second hand. 4 handed thats loose but not terrible hand for CO. Turn is probably ok. River I'd c/c rather than b/c. Not sure if that was meant to be a blocker bet or what. He represents essentually nothing with his raise, I honestly expected to see a busted FD. I dunno wtf he was doing turning up with that hand there.