The reason is: according to the shape of the mounted object.
The second method: 1, pear, apple, pineapple, peach, watermelon 2, cabbage, eggplant, radish, carrot 3, basketball, football.
The reason is: according to the nature of the goods.
The third method: 1, football, watermelon, basketball 2, pear, apple, pineapple, peach, green vegetables, eggplant and radish.
The reason is: according to the shape of the article.