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 collar fit perfectly on the neck of the dog but it could still not pass through the door of its cage. The _ is small.

SOLUTION: door

PROBLEM: The crab fled the filthy water for the fresh seaweed.  The _ made him as happy as a crab could be.

SOLUTION: seaweed

PROBLEM: James wanted to open the jar but he could not, so he opened the bottle and poured the oil in it. The _ lid is immovable.

SOLUTION:
jar