The first and most common one gave me exactly what I was looking for.

Those are the two most common things you're going to find available.

So we need to stay with the most common words.

Brown is the second most common color of human hair, after black.

He is the most common person to talk to the outside world.

The second most common cause is children playing with fire.

Although green and blue are the most common, any color can be used.

They are most common from 1 to 3 years of age.

Not the right answer, of course, just the most common one.

Nuclear families are not the most common sort of family.