The sentences with what people used to do and didn't use to do before the invention
of each item.
1. before the invention of the light bulb,
people used
people didn't use
2. before the invention of the fridge,
people used
people didn't use
3. before the invention of the television,
people used
people didn't use
4. before the invention of the internet,
people used to
people didn't use to
5. before the invention of the mobile phone,
people used
people didn't use
6. before the invention of the car,
people used
people didn't use
7. before the invention of the remote control,
people used
people didn't use
8. before the invention of the digital camera,
people used
people didn't use ​