Jawaban:

example:

1. when did people start watching television?

answer: people started watching television about 45 years ago.

2. when dis people start travelling in cars?

answer: people start travelling in cars about 15 years ago

3. when did people start reading printed books?

answer: people start reading printed books about 10 years ago

4. when did people start making telephone calls?

answer: people start making telephone calls about 25 years ago

5. when did people start using atomic power?

answer: people start using atomic power about 70 years ago

6. when did people start going to the cinema?

answer: people start going to the cinema about 30 years ago

7. when did people start flying in planes?

answer: people start flying in planes about 43 years ago

8. when did people start taking photographs?

answer: people start taking photographs about 25 years ago

9. when did people start listening to records?

answer: people start listening to records about 11 years ago

10. when did people start fighting with guns?

answer: people start fighting with guns about 76 years ago.