Help the exhausted film director correct his script notes for the upcoming zombie movie.

Every time the full moon _____, the zombies are supposed to _____ their arms and groan dramatically!

The correct answer is rises / raise.

"Rise" is an intransitive verb, meaning it does not take a direct object (the moon rises on its own). "Raise" is a transitive verb, meaning it requires a direct object (the zombies raise their arms).