Answer: It looks like you just need to cut off the last vowel (and consonant if there is one) of the word.
For number one, it's "perezosísimo"
For question 2, it's "aburridísimo"
For question 3, I think you do the same but keep it plural, so "interesantísimos" I would imagine.
Venga can go there or escucha
1. mamá te veré en la cena
2. sr. murray te veré más tarde
3.alma te veré otro día
4.sr benner nos vemos pronto en el pasillo
5. classmate Nos vemos mañana