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.

Mary brought a ball to the field to play soccer, but she couldn't because the _ was flat.
ball

I avoided the live wire but not the fence it ran along because the _ was safe to touch.
fence

The wood cutting board was covered in scratches from the knife, because the _ was so sharp.

knife