2. LOS niños SIMPATICOS
3. UNA muchacha TRISTE
4. MUCHOS amigos SIMPATICOS
5. UNA casa GRANDE
6. ALGUNA tarea INTERESANTE
7. LOS hermanos JOVENES
8. MUCHAS tareas DIFICILES
hope this helps!
estaba llorando
Mi hermana estaba llorando cuando los bomberos nos dijeron que la casa se quemó.
The answer is D. un.
Làpiz is a masuline word in Spanish, so "la" and "una" cannot be used since those are feminine. "Los" is also incorrect since that is the plural form, which is not being used in the sentence. Therefore, un is the correct choice.