In a second-hand bookshop I found a Key https://www.dropbox.com/s/bzyj0lexpilqork/Additional%20Latin%20Exercises%20to%20North%20and%20Hillard%20KEY.pdf?dl=0 to ‘Additional Latin Exercises to North & Hillard…’ and bought it on spec. Lo and behold, the ‘Additional Latin Exercises…’ are available on the Internet Archive and here https://www.dropbox.com/s/wlyyunp9ezuk29i/Additional%20Latin%20Exercises%20to%20North%20and%20Hillard.pdf?dl=0. To facilitate some exposure to good models of Latin prose I’ve extracted all the individual sentences from the exercise book here https://www.dropbox.com/s/wlgnjzaxt03g9h5/Additional%20Latin%20Exercises%20N%26H%20Sentences.docx?dl=0. As an experiment I’ve also recorded them using my Text-to-Speech program ‘TextAloud’. The Latin voice is an experimental application produced by eSpeak (http://espeak.sourceforge.net/); it’s a bit clunky but I think it’s amazing someone’s gone to the trouble to produce this at all. I had to put in macrons to correct the accentuation throughout, and many errors probably remain. Feel free to advise! The recording lasts about 4 hours and I’ve left a 10 second gap between the English and Latin to allow a little thought about the forthcoming translation. It can be listened to while driving or doing the dishes. If anyone’s interested I’ve uploaded it here https://www.dropbox.com/s/6ue7okqm762zf9t/Additional%20Latin%20Exercises%20N%26H.mp3?dl=0.
If you require more practice then there are all the continuous prose passages in the Additional Exercises to do, not to speak of the whole of North and Hillard which is on Textkit.
Best wishes,
Iolo.