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.

It took longer to study for the History test, than it did for the Math exam. That's cause the teacher is easier in _ .
math

Tom needed to decide if he wanted to use a homemade remover or commercial remover to remove the wallpaper, the _ version was harmful for the environment.
commercial

The public saw the news of the heist but not the arson because the _ had a visible agenda.

heist