单项选择题
During working time, everybody has to（）(注意)their’s own and other people’s safety.
A. take care of B. take over C. look after D. look for
单项选择题 There is signal light on the （）(桅杆).
单项选择题 There are some （）(贯穿螺栓) in the toolbox.
单项选择题 All the （）(金属板) and paint are to be supplied by the shipyard.
