When the interviewer asks about your work ethic they are looking for specific examples or keywords they can relate to. When you read the company job posting or job description do they refer to particular company ethics? Talk about their values and how those align well with your personal work values.
Some characteristics you may want to use are:
"I am a very dedicated and loyal employee. I saw on your website that you describe your company as honest, transparent and you go the extra mile for your clients. My work ethic is the same. I am honest, flexible, and come ready to work hard for my employer every day."
"My work ethic can be described as reliable, honest, and consistent. You are welcome to speak to my references in regards to my work ethic. I am very proud of my reputation in the industry."
"I am honest, dependable, and hard working. I am sure that any of my coworkers would agree."
Sales answer example
"I'd describe myself as really driven and goals-oriented. I love competition and am driven by it. Nonetheless, I am a team player. I never want to disappoint and will always go the extra mile both for my own goals and team ones as well."
Retail answer example
"I see myself as driven, dependable, and loyal. I always have my eye on the prize and what I want to achieve; I am always ready to jump into action whenever someone needs me; I stick with a company for the long term and love to grow with one organization, and help it grow in the process. I believe that my managers would describe me this way, too."
Teacher answer example
"I count myself among the most dedicated teachers, not only to my students, but also to my school. I am hard working, humble, kind, and passionate. I wake up every single day excited to go to work, excited for my job, my students, my school community. I want to bring my passion, humility, and drive to light up a new room and new school, hopefully yours."
Marketing answer example
"I would describe myself as excited to learn, driven towards growth, and someone who executes. I am certain my pasts bosses and clients would concur and I'd happily provide them as references."