Question

complete the poem with a word that rhymes.
give the king his purple ring!
he loves that thing. it makes him __!

Explanation:

To find a rhyming word for "thing" (ending with -ing sound), we look for a word that fits the context (how the ring makes the king feel) and has the same rhyme. "Sing" rhymes with "thing" (both have the -ing sound) and makes sense as an action the ring might inspire the king to do. Other possible words could be "king" (but repetitive) or "wing" (less contextually fitting), but "sing" is a strong choice.

Answer:

sing