Answer:
number 15 quietly, often
nuber 16 is tired,early
Explanation:
The part of speech that modifies a verb, an adjective, another adverb, or an entire clause or sentence.
Any of the words belonging to this part of speech, such as so, very, and rapidly.
In grammar, one of the indeclinable parts of speech: so called from being ordinarily joined to verbs for the purpose of limiting or extending their signification, but used also to qualify adjectives and other adverbs: as, I readily admit; you speak wisely; very cold; naturally brave; very generally acknowledged
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