英语作文：下面是王飞写给李平的一封信.请你根据书信内容,以李平的名义给王飞写一封意思连贯的回信.

Dear Wang Fei,
Thank you for your encouragement!I am really glad to receive your letter.I am doing much better in math this term.Because I take a math class every Tuesday and Friday this term.The teacher there are very friendly and patient,they can make math become easier than before.Now,I think math is not so difficult anymore.I believe I can get a good grade this time.So,how about you?Is everything fine with you?Will you have time and come to my house for your summer vacation?I can't wait!Please write to me soon!
Yours,
Li Ping