At the party，John made up a joke，________ people burst out laughing.
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A
on which
B
by which
C
at which
D
from which
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She has a gift for creating an atmosphere for her students _______allows them to communicate freely with each other.
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A
which
B
where
C
what
D
who
In the flats Tom was the only man from _______ bedroom the thief had stolen much money.
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A
whose
B
whom
C
who
D
where
Firms that use computers have found that the number of staff _____ is needed for quality control can be greatly reduced.
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A
whose
B
as
C
what
D
that
They talked for about an hour of things and persons _____ they remembered in the school.
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A
which
B
that
C
who
D
whom
is reported in the newspapers, talks between the two countries are making progress.
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A
It
B
That
C
As
D
What