помогите упражнение 12,очень нужно

1.received (это если утро теснее кончилось, а если нет, то has received идет, сможете подколоть учителя)
2. have bought; came up (лучше будет звучать I have already bought)
3. were trying
4. has risked (спорное предложение можно и risked ставить)
5. was reciting; held
6. noticed; had been reading
7. had мейд
8. were laughing; were watching
9. Where were you going; met
10. was
11. played
12. found
13. lived
14. rose; had sung
15. saw; has already left
16. feels; has been doing
17. was browsing
18. had been waiting; called
19. gave birth
20. has begun (при условии, что профессор все еще продолжает исследование, если нет, то ставим began)