1) Correct conjugation:
preparan
This is the correct conjugation because the noun here matches the third person plural and preparan is the conjugation of the verb preparar for the third person plural, too. Basically, this sentence tells us that the cookers prepare the food. Therefore, we can write this sentence as follows:
Los cocineros preparan la comida.
2) Correct conjugation:
tiene
This is the correct conjugation because the noun here matches the third person singular, that is, Ana can be replaced by the subject pronoun ella (she) and tiene is the conjugation of the verb tener for the third person singular, too. So this sentence tells us that Ana has her radio and is going to listen to it. Therefore, we can write this sentence as follows:
Ana tiene su radio y va a escucharla.
3) Correct conjugation:
mira
This is the correct conjugation because the noun here matches the third person singular, that is, Mi papá can be replaced by the subject pronoun él (he) and mira is the conjugation of the verb mirar for the third person singular, too. Thus, this sentence tells us that My dad watches television in the booth. Therefore, we can write this sentence as follows:
Mi papá mira la televisión en la cabina.
4) Correct conjugation:
mira
This is the correct conjugation because the noun here matches the third person plural, that is, los pasajeros can be replaced by the subject pronoun ellos (they) and vienen is the conjugation of the verb venir for the third person plural, too. Thus, this sentence tells us that The passengers come from the dining room and go to the pool. Therefore, we can write this sentence as follows:
Los pasajeros vienen del comedor y van a la piscina.