READ OUT LOUD. Choose which marked text you prefer to practice with - macrons or accent marks - and read the text out loud until you feel comfortable and confident. Then, try reading the unmarked text at the bottom. It should be easy for you after practicing with the marked texts. :-)
MACRONS. Here is the text with macrons:
Hirundō, cum līnum coeptum esset serī, suādēbat aliīs Aviculīs impedīre sēmentem, dictitāns omnibus fierī īnsidiās. Irrīdēbant illae garrulamque vocābant. Surgente līnō, rursum monēbat ēvellere sata; irrīdēbant iterum. Mātūrescente līnō, hortābātur populārī segetem et, cum nē tunc quidem cōnsulentem audīrent, Hirundō cum homine foedus init cohabitatque cum eō. Cēterīs Avibus ē līno rētia fiunt et laqueī.
ACCENT MARKS. Here is the text with ecclesiastical accents, plus some color-coding for the words of three or more syllables (blue: penultimate stress; red: antepenultimate stress):
Hirúndo, cum linum coeptum esset seri, suadébat áliis Avículis impedíre seméntem, díctitans ómnibus fíeri insídias. Irridébant illae garrulámque vocábant. Surgénte lino, rursum monébat evéllere sata; irridébant íterum. Maturescénte lino, hortabátur populári ségetem et, cum ne tunc quidem consuléntem audírent, Hirúndo cum hómine foedus init cohabitátque cum eo. Céteris Ávibus e lino rétia fiunt et láquei.
UNMARKED TEXT. Here is the unmarked text - after practicing with the marked text that you prefer, you should not have any trouble with the unmarked text:
Hirundo, cum linum coeptum esset seri, suadebat aliis Aviculis impedire sementem, dictitans omnibus fieri insidias. Irridebant illae garrulamque vocabant. Surgente lino, rursum monebat evellere sata; irridebant iterum. Maturescente lino, hortabatur populari segetem et, cum ne tunc quidem consulentem audirent, Hirundo cum homine foedus init cohabitatque cum eo. Ceteris Avibus e lino retia fiunt et laquei.
IMAGE. Here is an illustration for the story (image source).