
One possible version:
Dear Sherry,
Thank you so much for volunteering atChildren's Welfare Center.I want to let you knowwhat a great job I think you have done for thechildren.They really respond to you,and that isdue to how patient you are with them.I can findtheir reading and listening skills improving andtheir confidence growing under your guidance.Even those who used to struggle most in Englishare doing better now than before.You have such awonderful ability to meet each child at their abilitylevel and work up from there.The children are solucky to have you as an English teacher,and so arewe.
Looking forward to seeing you often!
Yours sincerely,
Li Hua