(idiomatic) to do one's best; to do something to the best of one's ability

devoted, unselfish (not selfish; selfless; generous; altruistic)

always

the best

dedication; devotion

pupil, educatee, student (especially in junior high schools (中学校) or high schools (高校) in Japan)

teacher

a cautionary tale, an example of what not to do / a person who serves as a living example of what to avoid

To exhaust; deplete; use up. / serve, assist

to do to exhaustion, to do something completely