1. In my composion, I tried to give a definition of humor, but I found the idea too (petty, elusive) to pin down.

Question

I think pitty is answer
2. Are you going to allow (elusive, petty) quarrels to destroy a friendship that has been built up for so many years? I think elusive
3. We will never allow vicicous rumors to (deem. generate) racial hatred in our school. I think generate

Answer 1

3 is correct.
1 and 2 are wrong.

Answer 2

humor means the quality of being funny