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The old professor has three sons，________are doctors.
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A
all of them
B
all of whom
C
all of that
D
all of which
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—I like traveling so much—      do my parents
#78095
A
which
B
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Diamond, _________, is the hardest of all materials.
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A
like we know
B
since we know
C
we know
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Nancy was always speaking highly of her role in the play，____，of course，made the others unhappy.
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who
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this
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Today，we’ll discuss a number of cases ________ parents have  much  difficulty  in  communicating  with  their  children.
#75514
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which
B
as
C
why
D
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He is a clever boy, _________ has big eyes and short hair.
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A
whose
B
who
C
which
D
that