The tooth had been troubling David for some time．He knew he should have gone to the dentist's【36】．But not caring about the pain he had【37】．he always put off going to the dentist as【38】as possible.
The dentist smiled pleasantly【39】．David told him that the tooth had kept him【40】the night before．Then the dentist looked【41】his mouth, but he did not look only at the one tooth.【42】he looked them【43】'Hmm,' he said．'I'm afraid【44】of your teeth need seeing to.'
He smiled again．But this time it was a rather terrible smile．He began to tell exactly【45】needed doing．David listened to him with a kind of sick feelings in his stomach.' I should say that at least four teeth have holes and then some of your old fillings are loose．We'll have to see to them immediately).'
David asked about the tooth that had been aching．'I may be able to save it,' the dentist said, and smiled terribly again．He got his electric drill (电动牙钻) ready．'Now,' he said with another terrible smile, 'this shouldn't hurt too much.' He came nearer.
(36)