Some topics are general and are regarded as 'classical' because they are always relevant across time periods through being relatable even as time progresses. For example, topics or themes about politics and satire would still prevail until now. Other topics or themes (such as viral videos) are only for that particular event and do not always occur, thus they do not prevail in the long run.
The past tense of cost is usually “cost”.
Very rarely is the past tense “costed” used, it’s more common to just say cost.
His experience and beliefs are well portrayed by the young lawyer in "The Bet" when the lawyer decides to forfeit his prize given his changed beliefs. Like the lawyer in the story, Chekhov devoted his life to what he believed in instead of focusing on his financial status.
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D. Students acting the parts of prisoners and guards