Задание 25 ЕГЭ, английский язык: Лексико-грамматические навыки

Образуйте от слова HISTORIC однокоренное слово так, чтобы оно грамматически и лексически соответствовало содержанию текста.

Many people think of the watermelon almost entirely as a dessert, but in some dry places around the world it is an important source of water to the natives. In others, it is a staple food and domestic animal feed. The watermelon belongs to the large gourd family, which includes melons, cucumbers, and squash. Its culture goes back to _________________ times.