Ответ:
1. Yesterday we didn’t get an invitation letter, did we?
2. The British students like to speak Russian, don't they?
3. A rabbit can run well, can't it?
4. Marsha isn’t a good pupil, is she?
5. The 5-form students will have IT lessons this year, won't they?
6. did we.
7. don't they.
8. can't they.
9. is she.