Answer:
tristissima
Explanation:
Puella is a noun and an adjective used with a noun must agree in case, number, and gender in Latin. In this case, "tristissima" agrees with "puella" because they are both nominative, singular, and feminine.
Hope this helps and bonam fortunam!
1. Ella almuerza en la cafeteria. - She has lunch in the cafeteria.
2. La camisa cuesta diez dolares. - The shirt costs 10 dollars.
3. El estudiante no recuerda la respuesta de la pregunta. - The student doesn't remember the answer to the question.
4. Charlie no puede nadar hoy porque no tiene su traje de bano. - Charlie cannot swim today because he doesn't have his swimsuit.
5. Sophie encuentra muchos peces bonitos cuando va a bucear. - Sophie finds a lot of beautiful fish when she goes diving.
6. La mujer vuelve de su viaje en dos dias. - The woman returns from her trip in two days.
7. El nino duerme muchas horas cada noche. - The boy sleeps a lot of hours every night.
These are all irregular verbs and need to be learnt by heart.