supposing that

【慣用的な分詞構文】の表現は穴埋め問題に出されるからしっかり覚えろ！【 talking of,  speaking of,  considering,  strictly speaking,  frankly speaking,  roughly speaking,  assuming,  generally speaking,  taking one’s age into consideration,  supposing (that),  granting that,  judging from,  providing (that),  seeing (that)】しっかり頭に叩き込んで、会話や作文の幅を広げろ！