1. b
2. c
3. b
4. c
5. a
6. b
7. b
8. c
9. b
10. a
11. b
12. a
13. c
14. b
15. c
16. c
17. a
18. c
19. b
20. c
ответ:Past Simple-They not bought a new computer yet
Present Perfect-They haven't bought a new computer
Объяснение:
