Ответ:

1. can't be changed

2. Nothing can be done to improve the situation.

3. You won't be asked to give one more lecture.

4. can't be changed

5. can't be changed

6. Dictionaries must not be used at the exam.

7. Only very important things will be discussed at our meeting.

8. Were you asked to tell this story again?

9. can't be changed

10. A lot of new books used to be published every year.

11. Should the conference be held at another place next time.

12. Our local sports centre is being reconstructed at the moment.

13. A new road is going to be built here.

14. can't be changed

15. The animals were being fed at that time.

Объяснение: