the lights have three (c ).we must (w )(f )the lights turns

the lights have three (c ).we must (w )(f )the lights turns when we go across the street we must ___the traffic lights.A We must ____(switch on/switch off)the lights before we leave We must wait for the green lights at all the ______(cross). the traffic lights are green.we can[ ] When the traffic lights are_ ,we must_ the traffic lights are yellow.we can [ ] We must pay attention in the traffic lights.哪个单词错了? ____ leaves the room last must turn off the lights. Do not ____electricity we should always ___ off the lights w the lights went out. the traffic lights