Answer:
5. enciende
6. pienso
Explanation:
Regardless of the fact that these verbs are considered irregulars, to choose the correct conjugated form take a look at the pronoun being used.
Since each pronoun as is own dedicated ending (which is why in Spanish you can omit the pronouns in sentences), focus on it to select the proper conjugation.
El Senor Leon = el (he) ~-a / -e => enciende
Yo (I) ~ -o => pienso
Pablo es serio
Serio being singular and the correct masculine adjective.
Is the first one
1. El pasillo
El pasillo means Hallway
Para completar la frase tiene que ser la palabra (NUBLADO)