Complete the folllowing sentences based on the given cues

Here are the completed sentences with corrections:

1. The house hasn’t been repaired since it **was** built.
2. Glass is usually **made from** sand.
3. The statue was cut out of stone. (This sentence is correct as is.)
4. She asked the guide where Phong Nha cave was the **most beautiful caves** in Vietnam.
5. When Andrew saw the question, he **knew** the answer immediately.