1. I am writing to you to apply for admission to your university as a visiting scholar.
我写信给你是要申请你的大学作为访问学者。
2. I read an advertisement in todays China Daily and I apply for the job...
我在今天的中国日报上看到一则广告，我申请这项工作
3. Thank you for your letter of May 5.
谢谢你五月五日的来信
4. How happy I am to receive your letter of January 9.
收到你一月九日的来信，我有多高兴。
5. How nice to hear from you again.
再次收到你的来信真高兴。