〜ぐらい / くらい about, approximately

Practice

ご苦労(くろう)。あの車両(しゃりょう)は港(みなと)の第(だい)七(なな)倉庫(そうこ)周辺(しゅうへん)に、どれ（　　）の頻度(ひんど)で現(あらわ)れているんだ？

Good work. With what frequency does that vehicle appear around Warehouse 7 at the harbor? (N5 lesson 31)

Answer

くらい