That expensive bag, at which place's shop did you buy? [Syntax]

The correct answer for the `★` position is `おみせ` (omise), meaning "store." It forms `どこのおみせで` (at which store) with `どこの` and the location particle `で`, asking "Where did you buy that expensive bag?". `どこ` (where) is an interrogative pronoun and should precede `の`. `の` is a particle used here to connect `どこ` and `おみせ`, meaning "which store's." `で` is the location particle marking where the action of buying occurred, and should follow `おみせ`. *Grammar Tip:* To ask "at which [place]," use the structure: `どこの` + [place noun] + `で` + [verb]? Example: どこのレストランでたべましたか (At which restaurant did you eat?).

正解は「おみせ」。「どこのおみせで」で場所を質問。「どこ」は「の」の前。「の」は助詞。「で」は場所を表す助詞で「おみせ」の後。 文法：「どこの～で」で場所を尋ねる。