假如你的笔友 John 将作为交换生在中国家庭生活一周，他写了一封 e-mail。
注意：
1）文中不得出现你的真实姓名和学校名称；
2）语言通顺，意思连贯，条理清楚，书写规范；
3）词数 80 左右，邮件的开头和结尾已经给出，不计入总词数。
Dear John,
向你求助。请根据邮件内容写封回信。
Dear Li Hua,
I will come to Nanjing in July and stay with a Chinese family for a week as an exchange student. To get along well with my host family, should I prepare any gifts? How can I help with the housework? What else should I do?
Please write back soon.
Yours, John
Dear John,
I'm glad you will come to China.
I hope you will enjoy your stay in China.
Yours,
Li Hua
