Directions：Your friend Smith told you he had started his own business. Write a letter to him to congratulate him and give him some helpful suggestions.
Dear Smith, I was happy to learn that you had opened your own firm and I would like to express my warmest congratulations. The final realization of your long-cherished dream should be attributed to your diligence, persistence and ambition. I am glad that your consistent pursuit of dream is rewarded now. As a good friend of you, I advise you to keep your ambition. Moreover, in response to challenges, please never overestimate the difficulties and underestimate your ability. Please accept my congratulations again. And I do believe you and your firm will achieve one success after another. Sincerely yours, Li Ming