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1.
Because shape of cover prevents from falling inside.
 
2.
round had no edges, it will not hurt the man who entering the hole
 
3.
So it would match the street, people can see it.
 
4.
Because it makes it easier to lifted in case of cleaning.
 
5.
So they can drive over it to get to Safeway.
 
6.
I am not sure but I can find that answer for you.
 
7.
So you can not open or fall through.
 
8.
Circular covers don't need to be rotated or precisely aligned when placing them on the opening. A round manhole cover is easily moved and rolled.
 
9.
A circle is the most energy efficient shape, that is why wheels are round and why bubbles are naturally round.
 
10.
For usability. Easy to fit, easy to handle, one person can roll and it can`t fall into the hole.