keep one's mind [brain] active
頭を働かせておく
keep one's mouth shut tight
口を堅く結んでいる
keep one's opinions to oneself
本心を述べない
keep [leave] one's options open
選択の自由を残しておく
keep [leave] one's options open
決定を保留しておく
keep one's promise [word]
約束を守る
keep [fulfill, break] one's promise
約束を守る［果たす，破る］
keep one's room clean and tidy
部屋をきれいにしておく
keep one's room in (good) order
部屋を整頓している
keep one's room neat
自分の部屋を整とんしている
