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.

[EX Q]: James asked for Jen's phone and put his phone number into it, since he wanted to text her on the _ later.
[EX A]: phone

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

[EX Q]: The tobacco farm wasn't doing well, so they replaced the pipes with conveyors as the _ were inefficient.
[EX A]:
pipes