Being a parent is not always easy, and being a parent of a child with special needs often carries with _______ extra stress.

. Intelligence is to some extent _____ one is born with 

Professor Zhang handed out the textbooks to all the students,except       who had already taken them.

Don’t take ________for granted that he will agree with you on that point.

_______ of my classmates could work out the maths problem because it was too difficult.