单项选择题
Please supply us with 250 tons of fresh water. You are requested to deliver it on board（）.
A.till Friday B.on Friday at the latest C.until Friday afterwards D.at Friday soonest
单项选择题 Please wireless to let me know（）I am to anchor or to meet pilot.
单项选择题 Pump out No.2 port ballast tank to（）.
单项选择题 She arrived at the anchorage last night and anchored（）berth.
