水手英语单项选择题每日一练(2020.04.21)

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1 When the derrick is stopped, the guy must be （）(收好).

2 （）（降）the flag.

3 Right on the course.（）

4 During working time, everybody has to（）(注意)their’s own and other people’s safety.

5 please lend me the （）.