Dear Li Yang,
Hi!I'm very happy to receive your letter and the gift and I do appreciate you very much.Given the circumstance that I have been busy with my studying since the third year in senior high school,I didn't write back to you earlier.I'm really sorry about that.
My family all likes the last gift.And thank you again for the introduction book on customs,culture and geography there sent by your school.My classmates adore me much after reading it.
I'm eagerly looking for your reply.
Best wishes