Using Only Five 5's and any mathematical operator make sum as 37

Can you name some countries which do not have the alphabet 'A' in them?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

I don't get anymore wetter, no matter how much rain falls on me.

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

I am white when I am dirty, and black when I am clean. What am I?