As ________ clear from his manners, he seems to be much of a scholar.
A. being B. is C. if D. though
While he was investigating ways to improve the telescope, Newton made ____ discovery which completely changed ________ man’s understanding of color.
A. a ; / B. a ; the C. / ; the D. the ; a
He never does anything wrong. He should be the ________ to blame.
A. least B. last C. worst D. best
Reading provides the mind only with materials of knowledge; it is thinking that makes ________ we read ours.
A. that B. what C. which D. it
We have done things we ought not to have done and ________ undone things we ought to have done.
A. left B. leaving C. will leave D. to leave
I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.
A. what it is B. what it does
C. what is it D. why is it
