Final answer:
The Spanish word that best completes the sentence is "sobrina" which means niece in English.
Step-by-step explanation:
The Spanish word that best completes the sentence is sobrina. "La hija de mi hermana" translates to "the daughter of my sister." Since "hija" means daughter, we can determine that the blank should be filled with a feminine word. "Sobrina" is the feminine form of the word "sobrino" which means niece or nephew in English. Therefore, the correct answer is Osobrina.
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