The time _________ I first spend with Nelson Mandela was a very difficult period of my life.
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when
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which
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of which
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at which
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(2013·乌鲁木齐高三第一次诊断性测验)That scientist ________ work is successful has been made a model worker.
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which
B
who
C
that
D
whose
The English play ____ my students acted at the New Year’s party was a great success.
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for which
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at which
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in which
D
on which
Many scientists believe that the universe began with an enormous explosion called the “Big Bang”, ______ happened about 13.7 billion years ago.
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that
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which
C
when
D
what
Nowadays almost everyone prefers to use a smart mobile phone functions are more practical.
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which
B
where
C
what
D
whose
We Chinese must stick to One-China policy, ____ is of great importance to China.
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that
B
which
C
what
D
where