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

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

What 5-letter word typed in all capital letters can be read the same upside down?

Why do you find that most of the buildings are deprived of the 13th floor?

What does this Rebus Picture mean?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?