4. Children collect things as a hobby.

Обоснование: В тексте сказано: "British children are encouraged to take up a sport or a hobby in their free time. Popular indoor activities include collecting things such as model cars, coins, stamps or stickers of football players or pop stars." Это прямо указывает на то, что дети коллекционируют вещи как хобби.

Ответ: 1) True