Нужно ответить на вопросы. 1.the students have made good progress in their english for the last three months, haven't they? . 2. he does not know the matter in detail, does he? . 3. the train will not be crowded now, will it? . 4. that was the main problem, wasn't that? . 5. we shall have no interpreter, shall we? 6. bobrov is an efficient worker, isn't he? 7. they are advertising the new model, aren't they? . 8. you have seen the advertisement, haven't you? . 9. he has seen the machine-tool in operation, hasn't he? .

1.The students have made good progress in their English for the last three months, haven't they?. Yes, they have.
2. He does not know the matter in detail, does he? No, he doesn't.
3. The train will not be crowded now, will it? Yes, it will.
4. That was the main problem, wasn't that? Yes, it was.
5. We shall have no interpreter, shall we? No, we shan't.
6. Bobrov is an efficient worker, isn't he? Yes, he is.
7. They are advertising the new model, aren't they? Yes, they are.
8. You have seen the advertisement, haven't you? No, I haven't.
9. He has seen the machine-tool in operation, hasn't he? Yes, he has.