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 used a battery to take pictures with the camera and put them in an album until the _ needed charging.

SOLUTION: battery

PROBLEM: They wondered if the blue powder or the red powder would dissolve faster, but they couldn't open the _ one.

SOLUTION: blue

PROBLEM: The ruler could not be used to draw a straight  line on the full length of the page because the _ is long.

SOLUTION:
page