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: I bought several tiny cases for my son to put his models in, but they didn't fit because the _ were too small.

SOLUTION: cases

PROBLEM: His legs got stronger from pulling the sled instead of pushing the block, although _ was heavier in weight.

SOLUTION: block

PROBLEM: She was supposed to be critiquing the artistic quality of the painting and sculpture, but the _ was missing.

SOLUTION:
painting