With the introduction of the electronic computer, there are no complicated problem ______ can be solved.
A. that
B. as
C. but
D. which
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In the testing period, the students spent ______ much time in the classroom on mathematics ______ they spent on any other subject.
A. as, as
B. as, that
C. so, that
D. such, that
Our confidence in the curative properties of the bottle of medicine remains the same ______.
A. like theirs
B. as they
C. as theirs
D. as them
______ steel is stronger than iron, men are able to make steel pipes with larger diameters.
A. While
B. If
C. Unless
D. As
Mr. Chen said that he would be punctual for the appointment, ______ he were late?
A. but what if
B. how about
C. so what
D. and what about