4、Please pardon my long in writing to you. 

5、Pardon me for neglect when you honored me with a visit the other day. 

6、Having mislaid your address, I have not been able to reply sooner. 

7、Your letter of the 4th this month was duly received. 

8、I have the pleasure to tell you that.. 

9、I have just received your kind letter. 

10、Your kind letter of Saturday arrived this morning. 

 

第二，结束语