Choose a definite or indefinite article to complete each sentence and fill in the blanks.
As it was with "grocery store" earlier, this could be either "a" or "the", but will sound most natural with "the".
Explanation
Using "a" in this sentence would be *grammatically* correct if you mean you are going to some unnamed grocery store, but will also sound a bit strange to a native speaker and may prompt someone to ask "which store?" Using "the" is also grammatically correct and the most naturally used article for native speakers with this sentence.