Answer : 1) Quiet, 2)slowly, 3) eventually and 4) really.
Explanation : Adverbs are defined as words which modifies the defining verbs, adjectives, other adverbs an sometimes sentences too.
In the word “quiet” it modifies the adverb word “slowly”.
The next word is "slowly" it is modifying the verb move (which is moved).
Now, this adverb “really” modifies the adjective which is “overjoyed”
Adverb “eventually” is a sentence adverb, which means "in the end"; this adverb helps to defines the general feeling about information given in the sentence.