If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.
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that
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which
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as
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what
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—What do you think of teaching, Bob?—I find it fun and challenging. It is a job ______ you are doing something serious but interesting.
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where
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which
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when
D
that
The position, however, ________ you are applying, is not quite a wellpaid one.
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that
B
for which
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which
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to which
Do you know the year ________ the Chinese Communist Party was founded?
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which
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that
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when
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on which
In the dark street, there wasn’t a single person _________ she could turn for help.
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that
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who
C
from whom
D
to whom