Hmm... if you are going for just one change, adding a semicolon after the word UFO would be the best choice. I would add an additional comma after the word however though, if you can make more than one change.
Everyone at the convention claimed to have seen a UFO; however, no one had taken a picture of one.
"Mlle" is correct. No further punctuation is necessary.
The correct punctuation for "The holidays, in my opinion, are depressing."
The correct punctuation change is: "The composer had a preponderance."
The correct punctuation for the sentence is: "Can you point me towards the elevator?"
The correct punctuation for "Sam is scared" is a period (Sam is scared.).
Highway can be abbreviated to hwy. or Hwy.
The US punctuation is: Yes, if I am correct, the answer is fifty-five. (or) Yes. If I am correct, the answer is fifty-five.
You would write:Maria shouted, "Great job, everyone!"You must use the quotation marks to show that it is someone talking. The commas signify a pause in speech, and the exclamation point is because she is shouting.
It would be: Yes, we can. (or more emphatically) Yes, we can!
The punctuation for the sentence is " No, I have never been to Europe."
The correct punctuation after the word "Hi" is usually a comma. For example: "Hi, how are you?"
YES