20. Your recent action not to replace the defective crane constitutes a flagrant _____ of contract. (A)breach (B)violate (C)damage (D)breakage 。

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