Mr. Smith didn’t understand _____ made his son so upset that evening.
A. what was it B. why it was this C. how that was D. what it was that
Although cats can not see in complete darkness, their eyes are much more ______ to light than human eyes.
A. brilliant B. attractive C. available D. sensitive
Don’t mention that at the beginning of the story, or it may _______ the shocking ending.
A. give out B. give away C. give up D. give off
I’m tired out．I stayed up the whole night, ______ for my midterm math exam．
A．studying B．to study C．to be studying D．studied
The first prize goes to _______ makes the greatest contribution to the company.
A. whomever B. whichever C. no matter who D. whoever
—There aren’t any toys in our suitcase．Where have you put them?
—Oh, no．That old lady sitting next to us ______ have taken ours by mistake.
A．must B．could C．should D．would
