Should parents stop letting kids choose what they eat and make them eat healthy food instead?

What is the best way to deal with an untrustworthy partner so that you can maintain peace in the relationship, but not let him/her take advantage of your kindness and generosity?
What is the best way to apologize for hurting your ex-girlfriend's feelings when she broke up with you and left without saying goodbye or giving any reason why?
What are some of the things that make your city special? What is unique about its culture? Where would you send a tourist to visit first, and why?
Have you ever witnessed a disruptive passenger on a flight? How was it handled and what impact did it have on your experience?
Why do some students disrespect their teachers in front of the class even though they know that their teachers will not tolerate that kind of behavior?