If it makes you feel any better, I'm fairly sure the answer to those questions don't count. I know I've gotten some reCAPTCHAs "wrong" and gotten marked as a human. It's picking up on a lot of signals, not just whether or not you're "right". So, the good news is you can relax, and safely rewrite all the questions to "Do I think this is a store front?" or "Do I think this square counts as a crosswalk?" or whatever without loss.
