10. We are in receipt of your letter of the 7th July
11. We are in possession of your letter of the 5th April
12. We have duly received your favour of the 5th March
13. Your letter of yesterday's date is duly to (at) hand
14. Your esteemed communication of yesterday's date is just to (at) hand
15. We thank you for your favour of the 5th May
16. We are obliged for your letter of the 5th May
17. Many thanks for your latter of the 5th June
18. Very many thanks for your letter of May 5
19. In acknowledging receipt of your letter of the 5th June, ...
20. Your favour of the 5th May has just reached me
21. Your favour of the 5th May is duly received
22. Your favour of the 5th May is now before me
23. Your promised letter under date (of) the 5th June has just reached us
（6）特回答贵公司某月某日函所叙述有关事项……
1. I have the pleasure of stating, in answer to your inquiry of the 4th inst, that
2. In reply to your letter of the 5th of May, I have to inform you that (of)
3. I hasten to answer your inquiry of the l5th May, by stating that
4. We are in receipt of yours of the 5th June, in reply to which we are pleased to state that
5. In reply to yours of the l0th May, relative to..., I would say that
6. I am in receipt of your favour of the 7th May, and in response I inform you that (of)
7. In response to your letter of l0th May, I wish to say that
8. In answer to your favour of the 5th May regarding... I reply as follows:
9. Answering your letter of the 8th of February re..., I would say that
10. In reply to your letter of February 8th, I inform you that (of)
11. Replying to yours of the 8th of February regarding..., I would say that
12. Replying to your favour under date of February 8th re..., I say that
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