What does this rebus mean?

O
N
C
E
TIME

People make me, save me, change me, raise me. What am I?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

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

Three people check into a hotel. They pay $60 for the rent of the room. After they check-in, the manager realize that the rent for the room is $55. So, he gives $5 to the bellboy and asks him to give it to them. The bellboy thinks that it will be difficult for the three people to share $5 among them and seeking the personal benefit, he pockets $2 and gives the remaining $3 to them.

Now, each person paid $20 and got back $1. In this manner, each of them paid just $19 which totals to the amount of $57. The bellboy has $2 with him and adding them, we get $59. So where is the remaining $1?

Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.

Hint: The grid reads the same across as down.

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?