The pen ______ he is writing is mine.
A. with which
B. in which
C. on which
D. by which
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______ was said have must be kept secret.
A. Whatever
B. Whichever
C. However
D. That
Jane wasn’t in when Jack came, was she ______, but she returned a few minutes later.
A. No, she was
B. No, she wasn’t
C. Yes, she was
D. Yes, she wasn’t
______ I want to know is ______ it is worth doing.
A. What; that
B. What; whether
C. That; why
D. That; what
—The problem wasn’t difficult for him, was it —______. He should have been given a more difficult one.
A. No, it was
B. Yes, it was
C. Yes, it wasn’t
D. No, it wasn’t