"don't _____to strangers on your way to and from school",my mother often _____to me.

1.speak to sb.是指和.说话,与..交谈,双方都说话
talk to sb.同某人谈话,主要是主语说话,而宾语一般不说话.
所以第一个不要和陌生人说话排除CD选speak
2.固定搭配tell sb.sth./tell sb.to do 告诉某人某事/告诉某人去做某事
say to sb.对某人说话
没有tell to sb.
所以第二个空要选says
综合起来选A