If he is very lucky, he doesn't get hurt, but usually they do. There have been people killed by ... as much as an issue as it use to be. So I guess you could also use detectors for life safety as well ...
I hope that helped
If this did not help you could just look it up
The first sentence is correct.
Answer:
This is not a social media app
The benefit of group work that is demonstrated in this example is enabling a complex task be broken down to simpler and fewer works. Since each individual had been given fewer task, it leads to increase of productivity while saving the time consumed in finishing the project.