Answer: determined (verb)
Explanation: you can replace 'determined' with the definiton.
The doctor did some tests and <u>figured out</u> the cause of the patient's pain.
maybe the author just want to keep that info secret and the story maybe not true at all so author doesn't want to tell readers, that what I think!
It is (in his attic room)! Words like in, about, outside, between are where prepositional phrases start.
