formal

https://tts.langeek.co/read?text=Zm9ybWFs&hash=b1c18144cb9a80d118be499c49f7fde0994d5511&lang=en&cache-only=0&driver=googletts

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