In which wrinting situatinal is formal english appropiate

In brave new world why does bernard dislike henry ford?

When first i engaged in this work, i resolved to leave neither words nor things unexamined, and myself with a prospect of the hours which i should revel away in feasts of literature . . –preface to a dictionary of the english language, samuel johnson what is the connotation of the word revel in this passage?

What happens in puerto rico in 2012 to celebrate the anniversary of clemente’s 3000th hit?