87. We have received many _____ about this product since its la unch in May. (A)interest (B)orders (C)inquiries (D)requirements 。

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 。