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

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

What work can one never finish?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

I cannot talk, but I always reply when spoken to. What am I?

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

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

What happened when the wheel was invented?

What's the only room from which no one can enter or leave

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?