TASK DEFINITION: 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.
PROBLEM: The bowling ball was more grams than the basketball because the _ took up more mass.

SOLUTION: bowling ball

PROBLEM: Jenna kept a list of her accomplishments and tried to grow her contact list in her career, but she found the _ to be more helpful concretely.

SOLUTION: list

PROBLEM: The building added several extensions that stretched it over the sidewalk, thus the _ 's space was infringed on.

SOLUTION:
sidewalk