You have failed two tests. You’d better start working harder, ____ you won’t pass the course. 
#30694
A
and
B
so
C
but
D
or
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Doctor Smith has made another wonderful discovery, _______ great importance. 
#30394
A
which I think is of
B
which I think it is of
C
which is I think
D
I think which is
 -–Do you think he will make a good teacher?--Yes, I believe he is ________ any good teacher.
#31409
A
as patient and devoted a man as
B
so patient and devoted a man as
C
a man as patient and devoted
D
such a patient and devoted man