Выберите подходящий модальный глагол в скобках.In many countries, men (have to/ don’t have to/ will have to) do military

In many countries, men have to do military service. I must go to school. It’s really necessary for my education. My brother and I will have to visit our granny at the weekend. We don’t have to go to school on Sundays. Nurses have to wear uniform at work.