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If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.
#77412
A
that
B
which
C
as
D
what
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The speed ______ Tom drives his car is too high.
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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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Modern science has given clear evidence ______ smoking can lead to many diseases.
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Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.
#76616
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