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What has no hands but might knock on your door, and if it does you better open up?

Answer: Opportunity.

More Classic Riddles with answers

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More Classic Riddles

What has to be taken before you can get it?
What is black when you buy it, red when you use it, and gray when you throw it away?
What is bought by the yard and worn by the foot?
What is it that given one, you'll have either two or none?
What is it that when you take away the whole, you still have some left over?
What is it that you ought to keep after you have given it to someone else?
What is more useful when it is broken?
What is often returned but never borrowed?
What is something you don't own but you can give it to anyone you meet? You only have one, but you can give it away as many times as you want without losing it. What is it?
What is that which every one can divide, but no one can see where it has been divided?
What is that which has many leaves, but no stem?
What is that which is invisible, but never out of sight?

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