21. In a/an _____ transaction, the sight draft is presented to the importerwith the shipping documents, and the importer pays immediately. (A)O/P(B)O/C (C)D/P (D)D/A 。

6. Much as we would like to do business with you, _____. (A)we are unableto accept your order at the price you requested (B)we will be pleased tofulfill your order No. A116 (C)we are prepared to give a further reductionof 5% in our quoted price (D)we expect to receive a new supply shortly 。