题目内容：
Suppose you heard the news that your friend Mike had just been promoted to be the manager of his department in the company. Write a letter of congratulations to Mike. Your letter should include:1 ) Why do you write this letter?
2) What's your feeling?
You should write approximately 100 words. Do not sign your own name at the end of your letter. Use "Wang Lin" instead. You do not need to write the address.
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