我踩上去时，薄冰咔嚓一声裂了。

The thin ice ___snapped as I stepped on it.

在激烈的比赛中，他的跟腱意外断裂了。

During the intense game, his Achilles tendon ___snapped unexpectedly.

他快速一动，将小树枝折成两半。

He ___snapped the twig in two with a quick motion.