With the help clues provided in the image, can you find the 5 digit key?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

What building has the most stories?

A Car is crossing a bridge 2 miles long. The bridge can only hold 10000 lbs, which is the exact weight of the car. The Car makes it half way across the bridge and stops. A bird lands on the car. Does the bridge collapse? Explain.

I travel all around the world but always stay in the corner. What am I?

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Which five letter word can be added at the end of below word to form a
valid word?

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