He is the only one of the boys who _____ in the exam.
A. have failed
B. has failed
C. fails
D. is failed
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We were deeply impressed by the students and the school ______ we has visited.
A. who
B. that
C. whom
D. which
The old man lived more than a decade in the old house _______ he could be in close contact with his neighbors.
A. in which
B. at which
C. which
D. where
Mount Blanc, _______ we visited last summer, is the highest mountain in Europe.
A. where
B. that
C. which
D. what
There is hardly an environment on earth ________ some species of animal or other has not adapted successfully.
A. to which
B. where
C. so that
D. as to