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

Those who smoke heavily should remind ________ of health, the bad smell and the feelings of other people.

We've got two TV sets, but we still can't watch anything because ______ works properly.   

I haven’t read ____ of his books, but judging from the one I have read I think he’s a very promising writer.

The number 5.12 is a special number, ______I think, that will be remembered by the Chinese forever.