When we arrived in ________ used to be called the foggy capital，we found London completely changed.London is now one of the capital cities in the world with the finest air quality.
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which
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The job is fun and challenging. It is a job ________ you are doing something serious but interesting.
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where
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which
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when
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that
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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which
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whom
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whose
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them
I wish to thank Professor Smith, without _______help I would never have got this far.
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who
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whose
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whom
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which