The report was not concrete and in a way lacked persuasion, but ______, I felt it is fair.
Paper produced every year is ________ the world's production of vehicles.
We have done things we ought not to have done and ______ undone things we ought to have done.
— Why weren't you at the meeting?— I ________ for a long distance call from my sister in America.
She will have to find some other work for she can't ________ this loud noise any more.
The boy said ________ couldn't he work out the problem but his teacher didn't know how to do it.