Answer:
Dear Teacher(her/his name)
Explanation:
Your have always helped me when I needed it.
Whenever I had questions you had answers.
Whenever I had doubts you gave reassurance.
I think your a awesome teacher and hope you have fun teaching.
Answer: Multiverse theory.
The world that Rick and Morty inhabit exists as part of the multiverse – a collection of different universes – offering infinite possibilities for the duo's adventures.
"Stuffed to the gills" means when you are really full and can't eat anything else. Hope this helped. I know how hard it is with idioms!