Dear Mr.or Miss
My name is Li Hua,and I'd like to be a volunteer of your Children's Welfare Institude.
I'm XX years old this year,and I really like staying with children.I always hope to take care of the children and play with them.And now I'll have a chance.My house is near your place and this would be a great chance for me to learn more things in life.I really hope you can can give me this chance.
Thanks
Love Li Hua