Susan is not the brilliant writer _____ she used to be.
A. which
B. that
C. who
D. whom
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I, who _____ your friend, will try my best to help you.
A. be
B. am
C. are
D. is
The size of the audience, _____ we had expected, was well over 1600.
A. as
B. that
C. which
D. who
They have started an investigation, _____ are being kept secret.
A. whose detail
B. whose the details
C. the details of which
D. the detail of it
Have you ever asked him the reason _____ may explain his absence?
A. why
B. for which
C. which
D. what