Based on the given sentence structure, here are the possible placements for the responses:
- "Las"
- "las"
- "los"
- "el"
The completed sentences would look like this:
Las mochilas están al lado de la puerta. Los estudiantes están en el salón de clase.
So the filled areas would be:
- Las
- la
- Los
- el
If you have different words to fill in, please provide them, and I can adjust the response accordingly!