Hooray! The children tick the boat on their activity sheets.

I mean you fill some form out once and a while and instead of checking the box that says Ms. you check the box that says Mrs.. It's right next to it.

Oh, we still haven't seen the tunnel. It's going dark. We're in a tunnel.

A signal box, that's on our list. Hooray! The children tick the signal box on their activity sheets.