Here are the suggested fill-ins for the blanks:

1. **assistance** - Digital technology can never be the teacher of the future but it will be the teacher's assistance.
2. **remotely** - Smart vacuum cleaners can be controlled remotely via smartphone apps.
3. **privacy** - My smartphone has a privacy mode feature that ensures my personal data remains secure.
4. **replacement** - When my old phone broke, I looked for a replacement with better camera features and battery life.
5. **interact** - Voice commands allow users to interact with their smart home devices.
6. **flexibility** - Her job requires a lot of flexibility as she often needs to adapt to sudden changes.
7. **wirelessly** - The camcorder has a wireless connectivity that makes it easy to transfer videos to other devices.
8. **stylish** - The phone case has a stylish design with a steel frame and rubber edges.
9. **relaxation** - After a long day at school, I use my tablet for relaxation by streaming my favourite shows.
10. **effectively** - These earbuds can effectively remove many of (lie outside noises).
11. **durability** - With a rubberized exterior, the portable Bluetooth speaker can ensure durability against accidental drops.
12. **connection** - Once the smartwatch is connected to your phone, you can receive calls and control your music playlist.

Feel free to adjust any words as needed!