假设你是李华,你班来自美国的交流学生患病三周,请写封信,内容,询问病情表关切,介绍班级活动（班级活动随意写）,学习情况,

Dear ××, I am so sorry to hear your health problem. How are you doing now? All of us in class are missing you now and hoping you can come back earlier. It's a pity that we went out for hiking without you. If you joined us in hiking, I'm sure we would be much happier that we could talk with you and have a great time together. We are studying Unit 6 now, I hope you can catch up with others quickly. If you have problems in studying, just send a letter to me, I'd like to help you. Best wishes to you, may you come back early. yours, Li Hua