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Courage is a virtue seems like the answer, but I haven’t read the book. Though, I’m making an education guess because it takes courage to go to the moon.
Based on that the use of foreboding in this sentence is used as a noun, the definition of foreboding would be:
A feeling or sense that something bad is going to happen.
1. Cat's (singular possessive)
2. boss's (singular possessive)
3. elephants' (plural possessive)
