Our restaurant is becoming……….…increasingly………..successful, so we will have to hire more staff.
This word is used because it is used to indicate that a situation or quality is becoming greater in intensity. And according to the statement, since the restaurant is becoming successful, so we used increasingly.
An adverb is a word that is used to change, modify or qualify several types of words including an adjective, a verb, a clause, another adverb, or any other type of word or phrase, with the exception of determiners and adjectives, that directly modify nouns.
Thus, he word increasingly is an adverb here because it is being used to describe how the success is changing.
Learn more on adverb here- brainly.com/question/1129340
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