______ Millie ______ Billy is patient with children. I think they can make excellent teachers.
–How long ______ the restaurant ______? --For eight years.
–What should I do ______ healthy, doctor? --You should take more exercise.
–Have all the boys known that they ______ an English test this afternoon? --Yes. Every boy has been told about it.
He offered ______ valuable advice that ______ people disagreed.
His grandfather ______ for twelve years.