Can you fill the blank with the correct number?

6 30 870 756030 _____

Which digit occurred maximum times between the number 1 and 1000?

The dirtier I get, the whiter I look. Who am I?

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

Make a sentence consisting of three words that have the whole alphabet.

What has lots of eyes, but can’t see?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

What has 88 keys?

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?