be careful to cross the street when we meet heavy ______(tra

be careful to cross the street when we meet heavy ______(tra 连词成句：cross,be,the,when,careful,you,street be careful to look both ways before------(cross)the street Paul,______（be） careful when you cross the road. When you cross the road,be careful of ______. Be careful when you cross the street.为什么用cross而不用across? Please be careful when you ______ the crowded street. you must be careful when you cross the street中可以用if替代when吗 You should BE careful when you cross the street in the big c 用cross,be,the,when,careful,you,street连词成句 You must be careful when you cross the street.改为祈使句 be careful when you cross the street,or you may __run over b