"Do not let any failures discourage you, for you can never tell how close you may be to victory. "
In the sentence, an “exclamatory sentence”, "how close you may be to victory" , acts as an object. I am wondering whether an exclamatory sentence can acts as a subject, complement or appositive.
Do the following sentences sound natural to you?
Sentence 1: How close you may be to victory is never known.
Sentence 2: My question is how close they can be to victory.
Sentence 3: They have no idea how close they may be to victory.
Thank you in advance!