--- How old are you, madam?--- If you _______ know, I’m twice my son’s age.
.The buses, most of _______ were already full, were surrounded by an angry crowd.
It was not such a good dinner _______ she had promised us.
David is such a good boy _______ all the teachers like him.
David is such a good boy _______ all the teachers like.
______ is mentioned above that the number of the students in senior school is increasing.