He (stay) in Paris for a week and (see) a lot of places of interest in the big city.

Может быть два варианта ответа. Мы можем поставить будущее время \"He will stay in Paris for a week and will see a lot of places of interest in the big city\". Или же, можем взять прошедшее время \"He stayed in Paris for a week and saw a lot of places of interest in the big city\".