Question

______ is an old word, meaning \to listen to and follow.\ it can also be used as a noun: \take ______ of my instructions,\ said the wizard, \for the magic potion will work only by the light of the full moon.\

Explanation:

We need to find a word that means "to listen to and follow" as a verb and can be used in the phrase "Take _ of my instructions" as a noun. The word "heed" fits these descriptions. As a verb, it means to pay attention to and follow advice or a warning. As a noun, the phrase "take heed" means to pay attention.

Answer:

heed; heed