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單項選擇題

The boat is （）to the water surface.

A.down
B.top
C.lower
D.up

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單項選擇題

Ready for （）the boat.

A.lower
B.lowering
C.lowered
D.topped

單項選擇題

We are going to carry out an emergency （）.

A.practise
B.practice
C.drill
D.drills

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