5. ___ cathedral is surrounded by monastery buildings that date from the 17th century.

The

Объяснение:
В первой позиции предложения перед словом (у которого нет артикля) могут быть указательные местоимения (This, that), артикли (the, a).

The cathedral is surrounded by monastery buildings that date from the 17th century.

Объяснение:

Мы говорим, что собор окружен монастырскими зданиями, построенными в 17-ом веке, из чего можно сделать вывод, что мы знам, о каком конкретно соборе идет речь. Соответственно, употребляем определенный артикль the

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