What does this rebus mean?

O
N
C
E
TIME

What does below Rebus mean ?

esgg sgeg gegs gsge

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What number should come in place of the question mark below?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

Decode the movie name from the below picture?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.