Answer:
The correct answer is, Todos los veranos Juan nada en el mar.
Explanation:
This is because you aren't talking about yourself or anyone else in the past. Juan is swimming in the present, for example, you were there at the beach with a friend and you tell your friend what Juan is doing. You would say Juan is swimming in the ocean.
It would be True, as if you dont have clean water, you will get sick from whatever is in the contaminated water.
The answer would be supe because that would mean Vistoria is refererring to herself knowing that the plane would get there late.