I was _____ during the lesson so I did not pay attention. interested bored interesting boring

In the context of your sentence, the most appropriate word to fill the blank would be "bored."

Here's why:

1. Understanding the Context: The sentence indicates a lack of attention during a lesson, which implies that the content was unengaging or dull to the speaker.

2. Word Usage:

   • "Interested" and "interesting" both suggest engagement or involvement with the material, which contradicts the idea of not paying attention.
   • "Boring" is an adjective that describes something that fails to engage one’s interest. However, it would not fit grammatically in the blank as it is not in the correct form.

3. Conclusion: The correct choice is "bored," which indicates that you felt a sense of disinterest due to the nature of the lesson.

Final Answer

I was bored during the lesson so I did not pay attention.