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:
The drifter pulled out his harmonica while riding the train and played a tune over the _ noise.
answer:
train


question:
I wanted to learn to operate a bulldozer this summer at the mine, so I asked my uncle to show me how to operate the _ .
answer:
bulldozer


question:
The school far outpaced the company in its technology, because the _ made substantial investments in it.
answer:

school