This is the only thing ______ I can do now.
A. what
B. which
C. that
D. all
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There are three libraries in our school, ______ were built five years ago.
A. all of them
B. either of them
C. all of which
D. both of that
He told me the reason _____ he didn't come here.
A. which
B. that
C. why
D. what
This is the reason _____ he told me.
A. that
B. why
C. on which
D. for that
Which of the two cows ____ you keep produces more milk?
A. which
B. that
C. what
D. as
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