94. Remember that was only an _____. The final cost could be higher. (A)estima te (B)esteem (C)expectation (D)exhibition 。

54. We appreciate your patience and please _____ that we will do everything i n our power to _____ that this type of error does not occur in the future. (A)assure....ensure (B)be assured....be ensured (C)assure.....be ensured (D)be a ssured....ensure 。