Given that “las responsabilidades” is the subject, “discutir” is going to be conjugated in the past participle:

Discutidas

Note that the past participle is an adjective and agrees in number and gender with the subject. (f., plural)

To form the passive voice in the preterite, we must add the verb “Ser” before the past participle:

Fueron + discutidas

Finally, let´s take a look at the full sentence:

Las responsabilidades del gobierno fueron discutidas en los periódicos./ The responsibilities of the government were discussed in the newspapers.

Given that “programas de salud” is the subject; “promover” is going to be conjugated in the past participle:

Promovidos

Note that the past participle is an adjective and agrees in number and gender with the subject. (m., plural)

To form the passive voice in the preterite, we must add the verb “Ser” before the past participle:

Fueron +promovidos

Next, we add the predicate to form the full sentence:

Varios programas de salud fueron promovidos por las enfermeras de la ciudad./ Various health programs were promoted by city nurses.

Given that “un discurso” is the subject, “leer” is going to be conjugated in the past participle:

leído

Note that the past participle is an adjective and agrees in number and gender with the subject. (m., singular)

To form the passive voice in the preterite, we must add the verb “Ser” before the past participle:

Fue+ leído

Finally, we add the predicate to form the full sentence.

Un discurso fue leído por el presidente del país./ A speech was read by the president of the country.

Given that “varios temas” is the subject, “tratar” is going to be conjugated in the past participle:

tratados

Note that the past participle is an adjective and agrees in number and gender with the subject. (m., plural)

To form the passive voice in the preterite, we must add the verb “Ser” before the past participle:

Fueron+ tratados

Finally, we add the predicate to form the full sentence.

Varios temas fueron tratados en el discurso./ Various topics were covered in the speech.

Given that “una nueva tienda de deportes” is the subject, “abrir” is going to be conjugated in the past participle:

abierta

Note that the past participle is an adjective and agrees in number and gender with the subject. (f., singular)

To form the passive voice in the preterite, we must add the verb “Ser” before the past participle:

Fue+ abierta

Finally, we add the predicate to form the full sentence.

Una nueva tienda de deportes fue abierta en el centro./ A new sports store was opened downtown.

Given that “clientes” is the subject, “entrevistar” is going to be conjugated in the past participle:

entrevistados

Note that the past participle is an adjective and agrees in number and gender with the subject. (m., plural)

To form the passive voice in the preterite, we must add the verb “Ser” before the past participle:

Fueron+ entrevistados

Finally, we add the predicate to form the full sentence.

Muchos clientes fueron entrevistados por los reporteros./ Many clients were interviewed by reporters.

Given that “las opiniones” is the subject, “escuchar” is going to be conjugated in the past participle:

escuchadas

Note that the past participle is an adjective and agrees in number and gender with the subject. (f., plural)

To form the passive voice in the preterite, we must add the verb “Ser” before the past participle:

fueron+ escuchadas

Finally, we add the predicate to form the full sentence.

Las opiniones de los clientes fueron escuchadas por el público.

Given that “el problema de la contaminación del río ” is the subject, “resolver” is going to be conjugated in the past participle:

resuelto

Note that the past participle is an adjective and agrees in number and gender with the subject. (m., singular)

To form the passive voice in the preterite, we must add the verb “Ser” before the past participle:

Fue+ resuelto

Finally, we add the predicate to form the full sentence.

El problema de la contaminación del río fue resuelto por un grupo de estudiantes./ The river pollution problem was solved by a group of students.

Given that “una campaña de limpieza” is the subject, “organizar” is going to be conjugated in the past participle:

organizada

Note that the past participle is an adjective and agrees in number and gender with the subject. (f., singular)

To form the passive voice in the preterite, we must add the verb “Ser” before the past participle:

Fue+ organizada

Finally, we add the predicate to form the full sentence.

Una campaña de limpieza fue organizada por ellos./ A cleaning campaign was organized by them.