Answer:
1. Susan sometimes feels <u>lonely</u>. <em>Adverb</em>
2. Rob slowly finished <u>his</u> dinner. <u>Adjective</u>
3. Your short story is <u>rather</u> funny. <em>Adverb</em>
4. Place your completed test <u>here</u>. <em>Adverb</em>
5. Quickly run <u>home</u> and ask Rob.<em> Adverb</em>
6. I often eat <u>Maine</u> lobsters. <u>Adjective</u>
7. She <u>quietly</u> read the news. <em>Adverb</em>
8. We processed <u>early</u> arrivals first. <u>Adjective</u>
Explanation:
Adverbs are those words that modify a verb or clause or sentences. They change or influence the meaning of the verb in the sentence.
On the other hand, adjectives help modify a noun and further help define nouns and pronouns. They deal with the nouns of the sentence while adverbs are based of the verbs.
Among the given sentences, sentences 2,6, and 8 are adjectives for they modify the noun(dinner, lobsters, arrivals) in their sentences whereas sentences 1,3,4,5, and 7 are adverbs as they modify the verb(feels, funny, place, run, read) in the sentences.