We must teach young children to cross the road safely

We must teach young children to cross the road safely We must be careful_____(cross) the road. 改错：We must not to cross the road when the light is red. Do you know how to cross the road safely?What should you do? we must teach the children to use the zebra crossing when ( We must prevent those children from running on the road Before we cross the road,we must stop and look both ways?loo Before we cross the road,we must stop and look both ways.对划线 这句话有没有错?We must make sure the road was clear before we cross before we cross the road ,we must stop and look both ways .改 the old lady looked at the children to cross the road . 为什么t 用适当的介词填空,We must cross the road _____traffic clothes.