1. The cat sat _on_ the mat.
* Preposition: _on_
* Explanation: "On" tells us the location of the cat (on top of the mat).
2. I walked _through_ the park.
* Preposition: _through_
* Explanation: "Through" describes the path taken (moving from one side of the park to the other).
3. She is _from_ Canada.
* Preposition: _from_
* Explanation: "From" indicates the origin or place of origin.
4. The book is _under_ the table.
* Preposition: _under_
* Explanation: "Under" tells us the relative position of the book (below the table).
5. He arrived _at_ 5 o'clock.
* Preposition: _at_
* Explanation: "At" indicates a specific point in time.