Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

I have branches, but no fruit, trunk or leaves. What am I?

I know a nine-letter word having only one vowel.
Do you ?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

It belongs to you, but other people use it more than you do. What is it?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?