Final answer:
The appropriate interrogatory word to fill in the blank in the dialogue is 'dónde' which means 'where' in English.
Step-by-step explanation:
The appropriate interrogatory word to fill in the blank in the dialogue is dónde. The dialogue is asking 'Where are you from?' and the response is 'Soy de Puerto Rico' which means 'I am from Puerto Rico'.
Learn more about Using interrogatory words in Spanish dialogues