1. not explaining anything
2. of being knocked down
3. of saying something inopportune
4. after being operated
5. being not only the author of brilliant short stories
6. while writing a report
7. talking him out of it is impossible
8. after entering the room
9. the thought of living there (не уверена)
10. by nagging him all the time
11. my being on the spot
12. after concluding several agreement there
вот, надеюсь тут все правильно