1. Technology has made it possible for people from all walks of life to have access to different resources. Further, technology is also being used to equip people who need a certain type of assistance to improve their quality of life and help them avail opportunities that would otherwise be inaccessible.

2. In my opinion, the cellphone is the most useful tech invention. This is due to the fact that the cellphone is the best way to connect with other people and to interact with them, no matter if it's in real life or not. The cellphone can help you in any way and it can make life much simpler, and for that, it is indeed the most useful tech invention in our modern day society.

3. I would say yes, technology changed the way people communicate with others in so many ways. Some examples of how technology changed how people communicate with others is through texting, emails, social media and so much more. By using technology, it makes it possible for people to communicate with each other from different parts of the world and it also makes it easier for people to stay connected with their loved ones. Technology also makes it possible for people to connect with each other through shared interests, experiences and ideas, which can also help in building relationships.

4. I'd say mostly in the service industry, such as fast food restaurants, hotels and so on. I think robots would be able to perform simple tasks and they could also provide assistance to customers if needed. I also believe robots will replace certain jobs in the manufacturing industry, such as assembly workers and machine operators. This would allow for more automation in order to keep up with the demand of products and would also lead to a reduced need for human labor. This could also save costs for the company and ultimately improve production rates, therefore making them more efficient and effective at their work.