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.
No entiendo la pregunta losiento
<em>una hamburguesa, papas fritas, un bocadillo.</em>
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<em>una ensalada, unos vegetales, unas frutas.</em>
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<em>una cola, un pan dulce, un té helado, la cena.</em>
Era un hombre muy poderoso y unos le tenían miedo.
