单项选择题
On hearing the fire signal, the crew should proceed immediately to （）their assigned duties.
A. carry on B. put out C. carry out D. take off
单项选择题 Efficient fire-fighting drill demands the full （）of persons in all departments of the ship.
单项选择题 The signals that will be used for emergency should be clearly （）.
单项选择题 The fire drill is （）. You are dismissed.
