Hi!
I can explain some of these...
#1 seems a bit subjective since you want to find a common relationship. Euthanasia causes death, so what causes love? Some might argue emotions cause love, while others might say devotion leads to love.
I am skipping #2 and #3 because I don’t think they make a lot of sense. I don’t see answers that give the second parts the same relationship as that of the first.
#4. Computation solves a problem, so what solves anger? Counseling
#6. An ornithologist studies penguins, so what does an elasmobranchologist study? Sharks
Hope that helps! I will leave the rest for you to try.