A.waterB.sandC.saw dustD.derrickYou’d better use （）to r……

单项选择题After leaving the port, we used （）to clean the empty holds and decks.

A. fresh water
B. sea water
C. both A and B
D. ballast water

单项选择题Everything on the bridge should （）clean and tidy.

A.kept
B.keep
C.be kept
D.keeping

单项选择题Decks, superstructure and hand rails may be washed with （）water at sea.

A.sea
B.ballast
C.fresh
D.cement

单项选择题The sailor keeping （）watch should clean the gangway, the rails, bulwark and the spaces around the gangway.

A.navigation
B.gangway
C.port
D.anchor

单项选择题The sailor taking （）watch should do cleaning work on the bridge.

A. 0 to 4
B. 4 to 8
C. 8 to 12
D. 12 to 16