Final answer:
The correct word to complete the sentence is 'boulangerie'.
Step-by-step explanation:
The correct word to complete the sentence is boulangerie. 'Boulangerie' means 'bakery' in French. So the complete sentence would be 'J'achète du pain à la boulangerie', which translates to 'I buy bread at the bakery'.
Learn more about Completing a sentence in French with the appropriate word