How do you use flunk in a sentence?

Here are some examples of how to use "flunk" in a sentence:

* Formal: "Despite studying diligently, she flunked her math exam."

* Informal: "I'm so worried I'm going to flunk this history test."

* Figurative: "The company's new marketing campaign flunked miserably."

* Humorous: "I flunked out of cooking school because I kept setting the oven on fire."

Note: "Flunk" is generally considered informal and is often replaced by more formal words like "fail" or "not pass."