If you really like something stuff of much of it as you can into your mouth, all at once. Don't worry, if you realise you have too much in your mouth to be able to chew, you can hold it there to go all squidgy then spit it into the table.
The dog does like oranges, don't listen to mummy. If you just keep following him around the house throwing segments at him, he will eventually eat one. The rest can be stood on or your sister will slip over them, whichever happens first.