介词填空 Dear Sirs, We are interested(1) buy large quantities of Iron Nails (2) all sizes and would be thankful if you could give us a quotation per metric ton CIF Lagos, Nigeria.Tt would also be appreciated if samples and a brochure could be forwarded to us.We used to purchase this article from other sources but we now prefer to buy from your corporation because we are given to understand that you are able to supply larger quantities (3) more attractive prices. Besides, we have confidence (4) the quality of Chinese products. We look forward to hearing from you (5) return. Yours Sincerely,