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.

[Q]: While taking classes at the college, Sam bought the textbooks she needed and returned the notebook she didn't. The _ were necessary.
[A]: textbooks


[Q]: To activate the computer we required a new charger, as the _ was dependent on it.
[A]: computer


[Q]: The scientist conducting the experiment poured chemicals into the vials until the _ was over.
[A]:
experiment