Ответ:

4. 1) The people look like they're enjoying themselves.

2) For me, the most important thing is to know when to stop.

3) It seems to me that internet addiction is growing.

4) They look as if they're concentrating very hard.

5) Personally, I think some gadgets are overrated.

6) The way I see it, many workers are exploited.

5. 1) a few

2) all

3) Most

4) a little

5) every

6) much

7) any

8) many