A company concludes a contract under CIF term. It receives a L/C issued abroad on 1 July. The opening date of the L/C is 20 June and the validity of the L/C is 15 August. Suppose that：the L/C stipulates "Prompt Shipment"，then the latest date of shipment is();the L/C stipulates "Shipment on or about 20th July"，then the date of shipment is();the beneficiary starts the shipment on 10 July and finishes it on 12 July. The ship arrives the port of destination on 20 August. The buyer takes delivery of the goods also on 20 August. Then, the date of B/L should be（);The time of document presentation should be no later than();The time of delivery for the seller is().Hints:You should answer the questions in English