Dentist always ask questions when it is impossible for you to answer . My dentist had just pulled out one if my teeth and had told me to rest for a while.I tired to say something,but my mouth was full of cotton-wool.He knew I collected birds' eggs and asked me whether my collection was growing was growing.Hethen asked me how my brother was and whether I liked m new job in London. In answer to these questions I either nodded or made strange noises. Meanwhile, my tongue was busy searching out th hole where the tooth had been. I suddently felt very worried,but could not say anything.When the dentist at last removed the cotton-wool from my mouth,I was able to tell him that he had pulled out the wrong tooth.