Gabriel’s grandfather is telling about his childhood.

Complete the sentences with the imperfect form of the verbs in parentheses.
Todas las tardes, ______ (haber) un programa por la radio.

To complete the sentence with the imperfect form of the verb in parentheses, you need to conjugate the verb "haber" in the imperfect tense. Here's how you can do it:

Todas las tardes, __había__ un programa por la radio.

To get the answer, you need to know the conjugation rules for the verb "haber" in the imperfect tense. In Spanish, the verb "haber" follows the following conjugation pattern in the imperfect tense:

Yo - había
Tú - habías
Él/Ella/Usted - había
Nosotros/Nosotras - habíamos
Vosotros/Vosotras - habíais
Ellos/Ellas/Ustedes - habían

In this sentence, the subject is not specified, so we can assume it is a general statement referring to a past period. Therefore, we use the third-person singular form "había".

So, the sentence should be:
Todas las tardes, __había__ un programa por la radio.