The key answer of exercise 5
The key to exercise solutions in chapter Skills Work 6 for the textbook On Screen B2 - Workbook & Grammar with authors Virginia Evans and Jenny Dooley from Express Publishing
Question
Why do you think the sound of a dentist's drill has a negative effect on people?
Answer
I think the sound of a dentist's drill has negative effect on people because they do not want to picture their teeth being in contact with something that could do them harm.