奶昔2021-10-23 23:08:18① I’m sorry I’ve been so slow in answering your letter。。。
② I have the pleasure （honor） to inform （tell） you that。。。
③ I must apologize for my delay in answering your letter。
④ I apologize for not writing to you for so long。
⑤ I was really surprised to receive your letter yesterday。
⑥ It was nice to hear from you again。
⑦ I was sorry to hear that。。。
⑧ Thank you for telling me about。。。
⑨ I hasten to write you a few lines。
⑩ Please excuse this very short note。
I am glad to hear of your continued success。
As I have not heard from you for long， I feel anxious。
I would have written to you before， but I have had so many things to do that I have not had one moment for myself。
I am very glad to hear that you are all enjoying good health。
Your kind letter afforded me much pleasure。
I am obliged for your prompt and gratifying reply。
We are very happy to say