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.

Winston went to the gym to get in shape, and decided to run on the treadmill and lift weights. The _ helped him lose weight.
treadmill

To clean my floors I use a broom and sometimes also use a mop, since I want to be thorough today I am using the _ on the floor.
mop

I've always wanted to write a book a mystery or crime book. The _ book would be based on my lost uncle.

mystery

