formal

https://tts.langeek.co/read?text=Zm9ybWFs&hash=b52acfa092776165d60d997b3e822beb5b94df7d&lang=en&cache-only=0&driver=googletts&accent=US

Here you will find the vocabulary from Unit 8 - Lesson 4 in the Top Notch 1B coursebook, such as "appropriate", "strictness", "informal", etc.