1.There is no doubt ________ Catherine is fond of dancing, for she always practices it on weekends.
A. whether
B. if
C. that
D. which
2.You have seen the girl ________ sister is a Chinese teacher.
A. whom
B. of whom
C. whose
D. of which
3.He found it increasingly difficult to read, ________ his eyesight was beginning to fail.
A. and
B. for
C. but
D. or
4. If it ________ for his invitation the other day, I should not be here now.
A. had not been
B. should not be
C. were not to be
D. should not have been
5.It ________ Mike and Mary who helped the old man several days ago.
A. was
B. are
C. were
D. had been
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