【答案解析】To Whom It May Concern,
Having learned from the Internet that you are recruiting a part-time waitress working in the evening, as a student from an ordinary family, I am writing to apply for the position so that I can be self-sufficient.
Firstly, I once worked in McDonald"s as a part-time waitress during my winter vacation, so I have the experience to be a perfect candidate for the job. Besides, my personality is well suited for working as a waitress: I am a very friendly person who can quickly establish a good relationship with people of all ages.
Thank you for your consideration of my application. I am looking forward to receiving a reply in the near future.