A possible version:

Dear Li Hua,

Thanks for your letter. I am very glad to tell you about my life and study here as an exchange student in California, the USA. Six months ago, it was my first time that I had been to the USA, so it was really difficult for me to fit in with the life here. On my arrival here, I couldn’t understand what people said or communicate freely with them in English, and nor could I get used to the different study pattern here, so I missed home a lot. Fortunately, I have adjusted myself to the new surroundings as soon as possible and seized every opportunity to practice speaking English with the local people. As a result, now I have made rapid progress in oral English and felt at home to live here. What’s more, I’ve also attended the preparation course which helps me to get used to the academic requirements in America and become a more autonomous learner.

Hope to see you again soon.

Best wishes.

Love,

Wang Ping

题目分析：这是一篇提纲类作文，我们需要用正确的英语把给出的要点表达出来.本作文中给出的要点比较具体,故需要准确表达.写作时注意准确运用时态，上下文意思连贯，符合逻辑关系，尽量使用自己熟悉的单词句式，同时也要注意使用高级词汇和高级句型使文章显得更有档次。特别注意在选择句式时要赋予变化。

点评：本文属于提纲类作文，动笔前，一定要认真分析要点，理解要点要表达的含义，不能遗漏要点，跑题偏题。平时除了加强词汇积累，写作联系以外，还可以适当记忆一些类似的范文，这样在考试中可以起到事半功倍的效果。