单项选择题
When a ship is in port, who will keep gangway watch?（）
A. An officer. B. A sailor on duty. C. Wharf man. D. An engineer.
单项选择题 -Good morning, sir. -（）. May I help you?
单项选择题 Let’s （） to the saloon, shall we?
单项选择题 He’ll （）for chief officer to meet you in a while.
