1. I don't believe that. Unhealthy or not, it depends on how much you use them.

2. I strongly agree. The internet contains mostly everything you need for any kind of homework, or knowledge in general, as long as you know how to find them. 

3. I partly agree with you. A lot of us spend too much time on social media. We start our day with social media, go through the day using it, and using it even before going to bed. The amount of people that are overusing it is considerable.

4. I believe that's true. Technology is replacing human labor everywhere. With computer skills, you can work in mostly any field that you want in the future. 

2. healthy 

3. debate

4. unfair

5. believe

6. concentrate

7. exam

8. against

9. blame