Riddles For 11.2.5

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1) Black When I`m Clean
White When I`m Dirty
What am I?

2) When it's alive, its life gets short.
When I kill it, its life prolongs.
What is it?

3) What does the star represent:

A N O
T * I
TENT

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ANSWERS:

1) Blackboard

2) A candle