Problem: What stone, still quarried in the Dorset (England) tied island which also bears its name, was used in the construction of St Paul's Cathedral and Buckingham Palace, and widely elsewhere too?
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A: portland stone

Problem: In which Charles dickens novel does the character 'Esther Summerson' appear?
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A: bleak house

Problem: What kind of an organism causes a 'rust' attack on plants?
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A: fungus

Problem: What type of fence, often painted white, is characterized as short with a tapered or pointed top on evenly spaced vertical boards?
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A:
picket