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


question:
Peggy filled the bathtub with hot water and bubbles but not salts, because the _ smelled awful.
answer:
salts


question:
We could not greet them at the airport, so we waited in the lot.  The _ made it hard to find them.
answer:

airport