Please advise if the preposition at the end of each of the following sentences is needed.<br/><br/><br/><br/>Which restaurant did you go to?<br/><br/>Which hotel do you stay at?<br/><br/>Which girl did you go out with? <br/><br/><br/><br/>Is there a rule to follow to determine if the preposition is needed in this case?<br/><br/>