Which option completes the paragraph below correctly?
Speak, FIDO!

Imagine you're out for a walk with your family when a strange dog approaches. The dog isn't aggressive, but it seems ______ something because it nudges you with its snout, and barks. What you don't know is that this dog is trained _______ a person with a medical condition. Around the corner, the doq's owner has collapsed, and the dog instinctively runs off _____ help. That's you! But how can the dog make you _______ what's wrong?
(Adapted from https://www.timeforkids.com)