What has to be broken before you can use it?

What does below Rebus say?

XLR8

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

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

What word is represented by this rebus?

Replace the question mark with the correct number below.

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?