关于外贸英语的题目Dear Mr..I am replying to your enquiry of the 5 May

关于外贸英语的题目
Dear Mr..
I am replying to your enquiry of the 5 May in which you asked about L.R.Naismith & Co.Ltd.With regard to the company mentioned in your letter of 8 December,we are willing to assure you that they have an excellent reputation in dealing with their suppliers,and though we have not given them the credit they have asked you for,we would allow them those facilities if they approached us.Please treat this information in confidence.
Yours sincerely
Questions:
1.What do you do before you write a reference?
2.What do you think of L.R.Naismith & Co.Ltd.as a firm?
3.What do you mean by they paid on due dates'?