Ответ:
1. Where did you go? I just took a walk.
2. Our students have done all kinds of exercises and now they are sure that they know this rule well. They hope they will not make mistakes in this paper.
3. The expedition have covered hundreds of kilometres, but they still are far from their destination.
4. Will you go to Great Britain next year?
5. Yesterday Nick said that he had read much during his summer holidays.
6. combined
7. A great number of students were studying in the reading room when I entered it last night.
8. raged, tried
9. had changed
10. entered, were listening
11. I don't think she will ever read such a book.
I don't think she has ever read such a book.