23.4.2 exercise: idiomatic expressions in the context of the time of the day
As a reminder: If there is no preposition before the time of the date, the article is not, in opposite to Spanish, compulsory. However if the preposition ends with a de, depois de, após de, antes de etc. in general there is an article, although this article merges with the preposition de, see 6.1.7. Furthermore the preposition de + article has to agree in gender and number with the object. Hora / horas is feminine we get therefor da / das, in case that a minute follows it is do / dos.
Choose the right option in the following sentences.