You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.

At the house, the tenant chose to use stones instead of bricks in the garden. The _ are ugly.
bricks

John dusted the furniture in his room with a towel and it got the _ dirty.
towel

The building's ancient foundation was re-enforced with a steel alloy during the remodel because the _ was crumbling.

foundation