Ответ:
1. It hasn't snowed this week
2. Did you see the news
3. left
4. Have you seen him?
5. I have lost it
6. visited
7. has gone
8. When did the last train leave?
9. I have just had lunch
10. Was the weather good when you were on holiday?
11. We haven't seen each other
12. I have ever read
13. has drunk
14. What did you do at the weekend?
15. He hasn't eaten anything
16. She didn't go to the library
17. How long have you known Bill?
18. has always wanted
19. Have you heard from Jack
20. lived