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 message with its number of bytes could not be sent in an email using the same internet connection because the _ is weak.

SOLUTION: connection

PROBLEM: He had to teach the science and math classes later, but he forgot the _ papers.

SOLUTION:
science