Which do you enjoy your spare time, playing cards at home or taking a walk in the park?
While he was investigating ways to improve the telescope, Newton made ____ discovery which completely changed ________ man’s understanding of color.
He never does anything wrong. He should be the ________ to blame.
Reading provides the mind only with materials of knowledge; it is thinking that makes ________ we read ours.
We have done things we ought not to have done and ________ undone things we ought to have done.
I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.