We all thinks that Jack ____________ for his son’s bad performance at school.

You look very tired. Why ______ and have a rest? [ ]

Do you know Australia was, as a matter of fact,________ used to be a nation of prisoners?

Most of the parents will do anything ____ they can for their children.[ ]

I found a story-book on the desk, it isn’t mine, it is ___,I think.