一、開首語
Pardon me, though a stranger to you personally, for taking liberty to address you these few lines.
As I have not heard of you for long, I feel anxious.
I must apologize for having not written to you previously.
Please pardon my long in writing to you.
Pardon me for neglect when you honored me with a visit the other day.
Having mislaid your address, I have not been able to reply sooner.
Your letter of the 4th this month was duly received.
I have the pleasure to tell you that.
I have just received your kind letter.
Your kind letter of Saturday arrived this morning.