单项选择题
A. Watch your feet! Get hold on the rails. B. Watch your step! Get hold of the rails. C. Watch your step! Get hold to the rails. D. Mind your head! Get hold of the rails.
A. The captain is giving orders. B. The pilot is giving orders. C. The quartermaster is giving orders. D. The pilot is given orders.
A. Mind your head. B. Watch your head. C. Watch your step. D. Watch your walking.