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.

[EX Q]: Mary brought a ball to the field to play soccer, but she couldn't because the _ was flat.
[EX A]: ball

[EX Q]: Sally needed to get a new pot to plant her ficus tree, because the _ was growing fast.
[EX A]: tree

[EX Q]: The tea was shipped in trucks rather than trains, as the _ made it easier to distribute nationally.
[EX A]:
trucks