False, every word has a part of speech that it belongs to.
Answer:
I'm sorry can you please clear what is your question is
the TV didn't work..........the electricity had cut out.

- while ❌
- because✔️
- before❌
- by the time❌

The TV didn't work <u>because</u> the electricity had cut out.

Answer:
Eliminate redundancies
Explanation:
Redundancies are extra parts of a sentence that don't add to the point that you are trying to get across. By removing these things the clarity of a sentence can be improved.
have a nice day!