Dense fog comes with bad visibility, fog signal bell must be kept ________at regulation intervals
A. to go
B. going
C. goes
D. go
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________ there much cargo in the warehouse？
Are
B. Is
C. Be
D. Will be
Hold No. 4 must be cleaned up to meet the ________ of the cargo surveyors
A. rules
B. necessity
C. requirement
D. statute
Be careful when you ________ the derrick
A. operating
B. operates
C. operate
D. operated
________ were brought back to ship from the sea
A. The crew
B. The crew member
C. A person
D. The members
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