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

[EX Q]: Mary tried to crack walnuts with her teeth for her heart healthy crunchy salad, but the _  were too weak.
[EX A]: teeth

[EX Q]: The police were prepared to protect the school but not the zoo as the _ had animals in it.
[EX A]:
zoo