If we are _______ of travelling, we see and learn a lot of things that we can never see or learn at home

The correct answer is "fond". The completed sentence is: "If we are fond of travelling, we see and learn a lot of things that we can never see or learn at home."

Translation: Если мы любим путешествовать, мы видим и узнаем много вещей, которые никогда не смогли бы увидеть или узнать дома.