We all consider _______ of great importance that we should combine theory with practice.
A. which
B. this
C. that
D. it
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If you turn to the right at the comer, you'll find a path to the historical building.
A. lead
B. leading
C. to lead
D. leads
The size of the people, __ we had expected, was a thousand.
A. whom
B. who
C. as
D. that
I have no idea of the topic ____________ by them right now.
A. to be discussed
B. being discussed
C. discussed
D. having been discussed
a certain doubt among the students as to the necessity of the study.
A. It existed
B. There had
C. There existing
D. There existed
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