______ of them could solve the problem, so we turned to a third person for help.
Of the seven days in a week, Saturday is said to be the most popular_______ for a wedding in some countries.
It's not_______ good idea to work hard for four hours without_______ break.
---My children are always arguing. ---_____________.
Battleship is ________ film I have ever watched. I have never watched _____ one.
I never doubt ______________.