這5道英文選擇題,選哪個?

題目：

這5道英文選擇題,選哪個?
11.We are sure that you will find a ready market for this quality product,and your customer will be well satisfied it.
A.for B.with C.on D.in
12.We offer you an article the highest quality at a very reasonable price and hope you will take the opportunity to try it.
A.at B.with C.of D.for
13.For orders reaching us before the end of the current month,we will a trade discount of 2%.
A.allow B.afford C.supply D.check
14.A trial order will you that the products will meet your needs to your satisfaction.
A.believe B.sure C.convince D.persuade
15.Being competitive for price and attractive in packing,our honey will be popular European customers with its special flavour.
A.with B.for C.against D.in

解答：

B
C
A allow a trade discount of 2% 讓利百分之2 選這個沒錯
C
A