.By around 900 AD,there were many places in Northern Europe______the Vikings chose to live.
#4786
A
in which
B
when
C
which
D
at which
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 Mr. Smith went to a bookstore, where a lot of books were        .
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A
produced
B
invented
C
housed
D
disappeared
.Walking alone in the deserted village, John was scared. He thought he ______Tom to go with him.
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A
might have asked
B
should ask
C
must have asked
D
should have asked
_________to reach them on the phone, we sent an email instead.
#4947
A
Fail
B
Failed
C
To fail
D
Having failed