Final answer:
The correct word to fill in the blank is 'está', which means 'is' in Spanish.
Step-by-step explanation:
The correct word to fill in the blank in the given sentence is está. The sentence would then be:
Acapulco está en México.
This sentence means 'Acapulco is in Mexico' and uses the verb 'estar' which is used to indicate location or state of being. In this case, it is used to show the location of Acapulco.
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