He is no fool at all,________,he is the smartest boy I have ever seen.
David is such a good boy _______ all the teachers like him.
______ is mentioned above that the number of the students in senior school is increasing.
______ is mentioned above, the number of the students in senior school is increasing.
_______ is known to everybody that the moon travels round the earth once every month.
_____ is known to everybody, the moon travels round the earth once every month.