Dental caries is a disease of the calcified tissues of the teeth caused by the action of micro-organisms on fermentable carbohydrates, isn’t it? Разделительный
What is characterized by demineralization of the mineral portion of enamel and dentine followed by disintegration of their organic material? Вопрос к подлежащему
Where does the disease produce changes in the form of reactionary dentine and pulpitis? Специальный
Does the infected necrotic pulp produce further changes in the periapical tissues? Общий
Can the progress of the disease be partly or completely prevented by relatively simple measures? Альтернативный
1. Don't go to Nick's place now, he is working. He will finish his homework at seven o'clock. If you come after seven, he will be very glad.
2. Has Pete gone to the cinema? — Yes, I think so. He usually plays in the yard at this time, and now he isn't there.
3. He was reading a book at five o'clock yesterday.
4. Will you go for a walk with me? — I am sorry, I can't. I am doing my homework. I haven't written the English exercise yet. If you wait for me, I will go with you in half an hour. I want to go for a walk very much, because I didn't go for a walk yesterday.
5. Yesterday the children had done all their homework before mother came home, and when she came, they were playing with the cat.
6. I lost my key when I was playing in the yard yesterday.
7. Ring me up as soon as you come home.
8. Where do you usually take books for reading?