12. The prices quoted above are provisional； _____ we may be compelled by ri sing costs of raw materials to increase our prices. (A)though (B)since (C)henc e (D)before 。

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 。