10. We went through a period _____ communications were very difficult in the rural areas.
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A
which
B
whose
C
in which
D
with which
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Many experts stick to the view _____ teacher development is the key to the education quality.
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A
which
B
what
C
that
D
where
While __________ for the bus, I happened to come across my childhood friend, Tom.
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A
waited
B
wait
C
waiting
D
to wait
In my opinion, life in the twenty-first century is much easier than ___________.
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A
that used to be
B
it is used to
C
it was used to
D
it used to be