Fill in the blanks with appropriate prepositions. Dear Sirs, We thank you _1_your inquiry_2_June 18 and enclose our quotation _3_curtain materials. We have made a good selection_4_patterns and sent them_5_you today_6_parcel post.Their fine quality,attractive designs and reasonable price_7_which we offer them will,we hope,convince you that these materials are _8_really good value,There is a heavy demand _9_them from house furnishers which we are finding it difficult to eet, but provided we receive your order_10_the next five days,we make you a firm offer_11_delivery by the end _12_July_13_the price quoted. _14_orders_15_one hundred pieces or more,we allow a special discount _16_5%_17_payment _18_confirmed,irrevocable letter of credit reaching us three weeksahead _19_ shipment date. We look forward _20_ receiving your order. Yours faithfully,