[Answer] 2. Finish the sentence with the best answer based on the idiom. "That happened out of the blue..."

Step 1 : Introduction to the question "2. Finish the sentence with the best answer based on the idiom. "That happened out of the blue...""

...1. "...nobody was expecting it!" 2. "...don't let it happen again!" 3. "...and it just turned red!" 4. "...and now I feel sick." "Out of the blue" means something unexpected and surprising. This term came from storms with thunder and lightning, as they would unexpectedly surprise people outside from the sky, which they referred to as the "blue".

Step 2 : Answer to the question "2. Finish the sentence with the best answer based on the idiom. "That happened out of the blue...""

"...nobody was expecting it!":

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