In folk tales, _______________________(全家年龄最小的总是最善良、最有成就).

答案：the youngest of the family is always the nicest and the most successful

　　解析：本句考查最高级的使用。

　The parents realize that _______________________(他们不能任由孩子们再那样浪费钱).

答案：they can not have their children wasting the money that way

　　解析：本句考查“任由”的翻译，也就是have sb.doing sth.的使用。

By practicing these, I have been able to _____________ (在智育方面我一直能不断进步).

答案： make constant progress in intellectual education

解析：“不断进步”是指不断取得进步，“取得进步”用短语make progress。“不断”应选择constant。“在智育方面”作状语置于句末。