【正确答案】Letter 1
Dear Sirs,
   With reference to our sales confirmation (S/C) No．7008 dated May 8,  2008,  we regret to say that your L/C has not yet reached us up to the time of our writing to you.
   As the shipment is near, in order to execute your order No．208, we ask you to instruct your bankers to open(establish/issue) a confirmed irrevocable L/C payable at sight, for the amount of US ＄100000 in our favor, available (valid)until July 18, 2008 so that we can receive it within this week.
   In order to avoid subsequent amendments, please see to it (make sure) that the stipulations in the L/C are in exact(strict) accordance with the terms in the contract．And we will make (effect)the shipment on the receipt of the relevant L/C．(Please see to it that the stipulations in the L/C are in exact accordance with the terms in the contract, lest it should be amended subsequently)
   We look forward to receiving your favorable response at an early date.
Yours faithfully,