1. It’s difficult to imagine it as an invention. Is it difficult to imagine it as an invention?

8. Ballpoint pen Car assembly line To clone

9. diesel digital stereo system dynamite

10. electric cell helicopter improvement

11. instant coffee laser manufacturer

12. match to patent penicillin

13. to perfect photocopier to pioneer

14. satellite Scotch tape steam engine

15. trainers telescope telegraph

16. typewriter tyre

17. Past Simple Passive was were V 3 / V ed

18. Past Perfect Passive Past 1827 1835 Matches had been invented before an incandescence lamp.

19. A … had been …by the time a … was (were) …. invented, developed, introduced, created, designed A camera had been created by the time a dishwasher was invented.

20. 1903 1800

21. 1888 1960

22. 1837 1608

23. 1888 1860s

24. 1955 1980s

25. 1765 1892

26. 1990 1975

27. 1827 1867

28. 1954 1937

29. 1939 1928