Răspuns:
1. People hadn't talked over the telephone before 1876
2. People hadn't used electric light bulbs before 1860
3. People hadn't travelled to space before 1961
4. People hadn't listened to the radio before 1924
5. People hadn't watched TV before 1926
6. People hadn't played computer games before 1981
7. People hadn't driven cars before 1895
