Question

помогите пожалуйста решить английский

Answer 1

1. have already explained
2. were explained
3. will be explained
4. is explaining
5. will believe (?)
6. happened
7. ended
8. offered
9. was offered
10. was put
11. will be put
12. opened up
13. when was morse code developed?
14. is repainted
15. repainted
16. was repainted
17.will be repainted
18. can be repainted
19. will repaint
20. were used