It is not safe to travel by standing at the road hoping to b

It is not safe to travel by standing at the road hoping to b cross和across有什么区别（When is the road is clear,it is safe to--- if you are sure that the road is clear ,it is always safe to if you are sure that the road is c____,it is safe to cross t if the road is___,it is safe to cross 为什么空里是填clear而不是empty? it is safe to draw the conclusion,not difficult to reach the School is not the safe place as it used to be．How to keep sc when it is safe （） the road river,it,the,in,not,to,is,swin,safe连词成句 it is not safe to play with candles .是什么句式? The boy likes piaying _ fire,It's not safe.A.to B.in C.with lt's fast to travel by underground.lt's safe to travel by un