老师警告学生们不要在湿滑的地板上奔跑。

The teacher ___warned the students not to run on the slippery floor.

医生警告他吸烟对健康的危害。

The doctor ___warned him about the health risks of smoking.

妈妈警告我不要玩得这么晚回家。

Mom ___warned me not to come home so late from playing.