Ответ:
1. I am sure I put down my keys somewhere.
2. Calm down. There is nothing to worry about.
3. Let's sit down somewhere and talk.
4. I heard a knock at the door but there was nobody there.
5. We didn't see anything.
6. The restaurant was really crowded. Everybody had a good time.
7. Be quiet! Somebody is coming.
8. I don't think anybody knows the answer to that question.
9. She can't go anywhere without people recognizing her.
10. I've got something to tell you.
11. I was really bored during the holiday. I did nothing and went nowhere.
12. I woke up and suddenly everything seemed better.
13. There was water all over the floor. It was everywhere.
14. There's something very attractive about her.
15. Did anybody see George Clooney's latest film?
16. Everybody is talking about the new soap opera.
17. I'm sure there is something downstairs.
18. I can't make my point clear. Nobody understands me!
19. Let's go somewhere different tonight.
20. Everybody must hand in their homework by Friday.
21. The trouble is that there is nothing for young people in this town.
Объяснение: