International situation is currently undergoing great changes ________ UNESCO plays an irreplaceable role in promoting international cooperation.
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A
which
B
what
C
where
D
that
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The old town has narrow streets and small houses _______ are built close to each other .
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in which
B
where
C
what
D
that
The new buyer identified a dozen new sources for the material, ___________ proved to be reliable．
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most of them
B
most of which
C
most of whom
D
most of those
There is an ongoing debate about the potentially harmful effects ________ text messaging can have on people's grammar.
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A
what
B
who
C
that
D
whose
Professor Lee arrived in Paris in 2009, ______, some time later, he was employed by a famous computer company.
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A
that
B
when
C
where
D
which
Guilin is the most beautiful place _____people all over the world want to visit.
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A
where
B
which
C
what
D
that