Here are the completed sentences based on the given cues along with their corrections:

1. The house hasn’t been repaired since it was built.
- **Mistake:** built
- **Correction:** it was built

2. Glass is usually made of sand.
- **Mistake:** (none)
- **Correction:** (none)

3. The statue was cut out of stone.
- **Mistake:** (none)
- **Correction:** (none)

4. She asked the guide where Phong Nha Cave was the most beautiful cave in Vietnam.
- **Mistake:** cave (should be "Cave")
- **Correction:** Cave

5. When Andrew saw the question, he knew the answer immediately.
- **Mistake:** knowing
- **Correction:** knew

This format identifies the mistakes and provides the required corrections.