Final answer:
The missing word in the sentence 'aller a la champagne, c’est' is 'à la', completing it to 'aller à la champagne, c’est', which means 'going to the champagne, it's' in English.
Step-by-step explanation:
Filling in the blanks in the sentence aller a la champagne, c’est requires knowledge of French grammar. The missing word can be an action verb or an article in this case. Considering that 'champagne' is a feminine noun, the correct article to complete the sentence is 'à la'. So the correct answer would be 'aller à la champagne, c’est', meaning 'going to the champagne, it's'.
Learn more about Completing a sentence in French