This kind of cakes ______ good while cakes of that kind ______ different.
A. taste; are
B. tastes; are
C. smells; is
D. look; are
Every means ______ tried, but in vain.
A. have been
B. has been
C. are
D. is
Where to find the teacher and where to do the experiment ______.
A. are not known
B. is not known
C. has not known
D. have not known
—Where is our head teacher —He's left a ______ saying that he has something important to do.
A. news
B. message
C. excuse
D. sentence
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