The word that best fits into the blank space is;
An adverb will be best suited to fill in the blank space. "Where" is an adverb that provides information about the location of a place or something.
An adverb is a part of speech that qualifies a verb, an adjective, a phrase, or another adverb.
There are adverbs that indicate the time, location, place, degree, type, or manner of something. For example, the adverb quickly tells us how fast something is. The adverb 'where' tells us the location of something.
In conclusion, the adverb 'where' fits into the blank space.
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