Решение:
- He has been finishing training.
- She has been scoring twenty points in the match.
- We have been watching all the Champions League matches this season.
- That's amazing! She has been running fifteen kilometers this morning!
- She has been buying some really nice rollerblades!
- Oh, no! I have been losing my money!
- My mum has been writing shopping list. It's on the kitchen table.
- Dad, you have been eating my biscuit!
- I'm tired. I have been watching three X-Files videos.
- Hurry up! They have been starting the film!
- Mary has been studying hard this year, so she'll pass her exams.
- Oh no! She has been dropping the plate!
Ответ: 1. has been finishing, 2. has been scoring, 3. have been watching, 4. has been running, 5. has been buying, 6. have been losing, 7. has been writing, 8. have been eating, 9. have been watching, 10. have been starting, 11. has been studying, 12. has been dropping.