a. I am keen on music concert and I believe it's much better to join the concert as a supporter. I have experience for volunteering.
b. Dear Mr. Claire Veneer,
c. Last year, I helped at a charity project at a orphanage. I was in charge of decorating the stage and helping in carrying things. I am responsible and energetic.
d. I noticed your advertisement for volunteers in supporting school concert, and I am writing to apply for the role.
e. I look forward to hearing from you soon. Yours sincerely, Minh Ngan
f. I am available for music concert the whole day. Moreover, I can get there by bike.