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

The couple are so warm-hearted that ____ of them spares efforts to help others.

Cars do cause people some health problems, in fact far more serious _____ than computers do. 

 I'm moving to the countryside because the air there is much fresher than _______ in the city.

From the teacher’s patience and understanding, I have learnt what a big responsibility______is to educate us.