1. When was the telephone invented? 2. are being translated; 3. will be written; 4. is spoken; 5. had been painted; 6. has been washed; 7. must be answered; 8. were built; 9. will have been prepared; 10. has been played; 11. was being painted; 12. are usually sold; 13. will be discussed; 14. has your composition been written; 15. is being cleaned; 16. be seen; 17. What is usually made; 18. will have been received; 19. is being discussed; 20. is washed