单项选择题
Put the（） on the lines.
A. rat guards B. stopping guards C. fenders D. planks
单项选择题 We should （）the national flag when the sun rises.
单项选择题 The main tasks for sailors on duty are, first of all,（）the persons who come on board to do their business.
单项选择题 Where are （）goods carried on board?
