括号里应该填什么单词?( )at a red light ( ) at a yellow light ( ) at a green light

问题描述:

括号里应该填什么单词?( )at a red light ( ) at a yellow light ( ) at a green light

stop at a red light wait at a yellow light go at a green light.
红灯停,黄灯等待,绿灯行