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單項選擇題

Bolts, nuts, split pins, hinges, wheels and stoppers should be frequently （）.

A.checked
B.closed
C.removed
D.cleared

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單項選擇題

Before opening and closing the hatches, the spaces around the covers, all the parts and the gears should be （）.

A.cleared
B.checked
C.removed
D.repaired

單項選擇題

The foreman said three （）would come on board to load cargo.

A.teams
B.parties
C.gangs
D.pairs

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