Read this passage from the Article:
There, skateboarders try out their tricks, meet up with friends, and kick back and enjoy the camaraderie of the skater crowd. Lucky observers can watch expert riders hone their skills by attempting super-tough tricks that only they can pull off—or, as skaters would say, burlies only a ripper can stick.
In this passage, the word hone means __________.
to refine or perfect
to ignore the rules
to share or teach
to compete with