1. All the lights went out and we were left in the dark.

2. All the lights went out and we were left in the darkness.

3. All the lights went out and we were left in dark.

4. All the lights went out and we were left in darkness.
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Which expressions are acceptable?
"In the dark" seems to be right. What about the others?

1 and 4 are best, and 2 is okay. 3 is not correct.