He burned all the important documents ______ that they should fall into the enemy’s hands.
A. unless
B. so
C. lest
D. for fear
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With the introduction of the electronic computer, there are no complicated problem ______ can be solved.
A. that
B. as
C. but
D. which
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