I did my best for the exam.

He always keeps a smile on his face.

We always strive for the best results.

He is enthusiastic about his work and always does his best.

He is enthusiastically working on a new project.

He is studying earnestly.

He exhausted all his strength to finish the job.

He exhausted himself by working to the limit.

I work hard every day.

He is looking for a new job.