Verified answer

Ответ:

1. She lived there last year.
2. Mary has bought a new hat.
3. We travelled around Europe last year.
4. I have just met our teacher.
5. The children have already decided what to do with the books.
6. Where did you spend your holidays?
7. I have never visited that place.
8. He visited that place last year.
9. I have just got a letter from Tom.
10. I haven't yet eaten today.
11. He didn't eat yesterday.
12. Have you seen Mary today?
13. When did you see Mary? - I saw her last week.
14. He is not at school today, he has fallen ill. - When did he fall ill? - He  fell ill yesterday,
15. He has just come home.
16. I read this book last year.
17. It was very cold yesterday.
18. I have never spoken to him.
19. What books did you read when you lived in the country?
20. He did come a moment ago.

Объяснение:

Present Perfect - важен сам факт того, что действие УЖЕ произошло, но когда не важно (already, by now, yet...)
Past Simple - важно КОГДА произошло действие (las week, yeasterday, a minute ago...)