At crossroads,we always see the traffic lights.When the red light is on,we should ________ .When the green light is on,we can _____________.

问题描述:

At crossroads,we always see the traffic lights.When the red light is on,we should ________ .When the green light is on,we can _____________.

At crossroads, we always see the traffic lights. When the red light is on, we should _stop_ . When the green light is on, we can _go_.