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.

The man said little about the bridges he saw, but talked for hours about the cathedrals, because he was passionate about the _ .
cathedrals

The engineer created robots to replace the algorithms at solving the puzzle. The _ were more advanced.
robots

Hank was eating cereal and spilt milk on his cargo pants and decided to get his pleated pants. He needed to change into new leggings because the _ are dirty.

cargo pants