The sentence which should Lars include in the blank to maintain a formal style is "get with the program".
Formal style is a broad term for speech or writing marked by an impersonal, objective, and precise use of language. A formal prose style is typically used in orations, scholarly books and articles, technical reports, research papers, and legal documents.
Formal writing is written for an audience you do not know on a personal level. It is often the main style in academic writing and is more complex than informal writing. Formal writing is serious.
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