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:
Herināceī, hiemem adventāre praesentientēs, blandē Vīperās rogāvērunt ut in propriā illārum cavernā adversus vim frīgoris locum sibi concēderent. Quod cum illae fēcissent, Herināceī, hūc atque illūc sē prōvolventēs, spīnārum acūmine Vīperās pungēbant et vehementī dolōre torquēbant. Illae, male sēcum actum videntēs, blandīs verbīs ōrābant Herināceōs ut exīrent, quandoquidem tam multīs locus esset angustus nimis. Cui Herināceī: “Exeant (inquiunt) quī hīc manēre nōn possunt.” Quārē Vīperae, sentientēs ibī locum nōn esse, cessērunt hospitiō.
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):
Herinácei, híemem adventáre praesentiéntes, blande Víperas rogavérunt ut in própria illárum cavérna advérsus vim frígoris locum sibi concéderent. Quod cum illae fecíssent, Herinácei, huc atque illuc se provolvéntes, spinárum acúmine Víperas pungébant et veheménti dolóre torquébant. Illae, male secum actum vidéntes, blandis verbis orábant Herináceos ut exírent, quandóquidem tam multis locus esset angústus nimis. Cui Herinácei: “Éxeant (ínquiunt) qui hic manére non possunt.” Quare Víperae, sentiéntes ibi locum non esse, cessérunt hospítio.
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:
Herinacei, hiemem adventare praesentientes, blande Viperas rogaverunt ut in propria illarum caverna adversus vim frigoris locum sibi concederent. Quod cum illae fecissent, Herinacei, huc atque illuc se provolventes, spinarum acumine Viperas pungebant et vehementi dolore torquebant. Illae, male secum actum videntes, blandis verbis orabant Herinaceos ut exirent, quandoquidem tam multis locus esset angustus nimis. Cui Herinacei: “Exeant (inquiunt) qui hic manere non possunt.” Quare Viperae, sentientes ibi locum non esse, cesserunt hospitio.
IMAGE. Here is an illustration for the story (image source).