Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Why do people go to bed?

Which is the correct shadow of the bird?

what does the below rebus means?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

What can you serve, but never eat?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

What you cannot hold but it is yours?

Find the 8 in the below-given Image.