Dear sirs,

We have （） your l/c no.786 for 3000 cases of iron nails .we are sorry to inform you that as the earliest steamer （） for your port is to leave shanghai on october 2, it is therefore , impossible for us to effect shipment by the time of september. This being the case, we have to ask you to （） the date of （） to the 15th of november and validity of l/c to the 30th of nov ember ,and please let us know before october 1. thank you for your （） very much.

Yours faithfully.

正确答案：received；

sailing；

extend；

shipment；

agreement