1.Highlight a rare skill
You lived abroad for a few years and are acquainted with the customs of a country the company wants to develop in? Mention it! "My experience in the ... company allowed me to live in China. As such, I would be able to give you insights on the relationship with your subsidiary in Asia."
2.Show your social skills
You might be as skilled as the other applicants, but your soft skills will make all the difference. You are committed to solidarity projects? You coach your town’s rugby team? "I've been a rugby coach for 5 years. I teach my players teamwork, solidarity, and a will to move towards a common goal. I can convey these values within the company and in the missions I am responsible for." This answer shows your energy and how you can swing into action on a task.
3.Be a politician, repeat the interviewer's question.
When the interviewer asks, "I have one last question for you: why should we hire you?", you can echo the question, "Why should you hire me?" and then go on with your answer. This little trick makes the conversation more natural, and will influence the interviewer positively towards you. "Why should you hire me?" is also one of the questions you can ask during an interview.