Answer:
1) <u><em>Mucho</em></u> instinto, 2) <u><em>Menos</em></u> fijo, 3) <u><em>Nunca</em></u> eventual, 4) <u><em>Posiblemente</em></u> ansioso
Explanation:
Adverbs are words that modify the sense of a verb, an adjective and even another adverb.
1) <em>Instinto</em>
<u><em>Mucho</em></u> instinto
Mucho is an adverb related to quantity.
2) <em>Fijo</em>
<u><em>Menos</em></u> fijo
Menos is an adverb related to quantity.
3) <em>Eventual</em>
<u><em>Nunca</em></u> eventual
Nunca is an adverb related to negation.
4) <em>Ansioso</em>
<u><em>Posiblemente</em></u> ansioso
Posiblemente is an adverb related possibility or doubt.
