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 _____________.
答
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_.