The government of the United States began at once to investigate the case ______ a lot of students were killed.
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A
that
B
when
C
where
D
why
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I was given three books on sewing, the first ______ I really enjoyed.
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A
that
B
which
C
of which
D
of that
That e-book is no larger than an ordinary book with a screen ______ you can read original book and film reviews.
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A
in which
B
of which
C
that
D
where
is expected that it will be fine tomorrow, when we can do some outdoor activities．
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A
As
B
It
C
That
D
Which
The people's government took good care of the children, four fifths of _____ parents lost their lives in the Anti-Japanese War．
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A
which
B
whom
C
whose
D
them