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: We took the tools out of their individual bags and put them in boxes, as we wanted them together, so the _ were no longer needed to store them properly.

SOLUTION: bags

PROBLEM: As the gas filled the room, most people opted for the mask instead of the bag since the _ was efficient.

SOLUTION: mask

PROBLEM: At night, the eagle could see more of the cave than the panther because the _ had better day vision.

SOLUTION:
panther