reaction

https://tts.langeek.co/read?text=cmVhY3Rpb24&hash=07fb3cafe0e1d985ba39881dd8da178d35cf8a3f&lang=en&cache-only=0&driver=googletts&accent=US

Here you will find the vocabulary from Unit 7 - 7C in the Insight Intermediate coursebook, such as "vibrate", "conclude", "situate", etc.