

大事なことはノートに書き留めておきます。
先生の話を全部書き留めるのは難しいです。
さっきの電話番号を書き留めましたか。
"かきとめる(書き留める)" is in the lesson "Verbs 9" (Level 21), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.