mistake, allow, ship, valid, inform, apology, understand, extend, ready, guarantee Dear Jack, We regret to 1) you that we can ’ t prepare the goods 2) before the 3) of the L/C because of the delay of the raw material supply. In order to make the 4) . Please 5) the validity of the L/C to September 15 th , 2018. We 6) that we will make the shipment on August. Please 7) us to express our 8) again and we promise that such 9) will not take place in our future transactions. Thank you again for your 10) in advance. I am looking forward to your early reply. Yours sincerely,