Due to shortage in supply, we cannot make delivery in time. We, therefore, ask you to ______ the date of shipment to May 5 and the validity of the credit to May 20.
Due to shortage in supply, we cannot make delivery in time. We, therefore, ask you to ______ the date of shipment to May 5 and the validity of the credit to May 20. 【正确答案】：extend
