It seems that you are looking to fill in some blanks related to the general subject of a text and the most important idea in a text. Based on the context provided, here are the likely responses:
**General Subject**: topic
**Most Important Idea**: main idea
**Authors Use ... to Support**: details/examples/evidence
So a filled-out response might look like this:
The topic is the general subject of a text, and the **main idea** is the most important idea in a text. Authors use **details/examples/evidence** to support the **main idea**.
If you need to clarify or adjust any specific terms, please let me know!