based on 4A ex.1

Correct the sentences. Use the words: common, problem, clean, inventions, obstacles, conflicts, reality

1. There are many
   [ ] to overcome when trying to create a perfectly functioning robot.
2. In my opinion, the main
   [ ] with mobile phones is that their buttons are too small.
3. It is only a matter of time before there are robots that
   [ ] and clear in every home.
4. These days it is quite
   [ ] for children as young as ten to have a mobile phone.
5. Computers and the Internet are two fascinating
   [ ] of modern technology.
6. According to Asimov, a robot must not do anything that
   [ ] with the three Laws of Robotics.
7. Many of the gadgets we see in films don't exist in
   [ ].