'After the first round, the competitors must eat slowly before the next round begins', is the correct form of sentence after adding adjective and adverb.
An adjective defines the quality or quantity of a noun or a pronoun in the sentence. And the adverb is used to denote the way in which the action takes place in the structure of a sentence.
Hence, the significance of an adverb and an adjective is aforementioned.
Learn more about adverb and adjective here:
https://brainly.com/question/2557615
#SPJ1