You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: EXPRESSIONS 
Clue: This positive expression used since the 1940s promotes a type of stove

Answer: "now you\'re cooking with gas"


Question: Category: THE WINTER PALACE 
Clue: In 1881 the "Czar Liberator", the II czar of this name, asked to be taken to the palace to die after being fatally wounded

Answer: alexander ii


Question: Category: LET'S LEARN SCOTTISH GAELIC 
Clue: Linne Chluaidh is Gaelic for the body of water known by this distinctively Scots name

Answer:
firth