Answer:
B. Se lastimo
Explanation:
A means more than one person is present and got hurt. C means someone hurt here and D means I hurt myself, which doesn't make sense if you put that in the blank.
Uno se preocupa cuando estas asiendo un examen importante y piensas que no lo vas a pasar.
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.