Объяснение:

1. Напишу только концовки предложений:

1. ... than St Petersburg

2. ... was wide and deep

3. ... from all parts of Russia

4. ... than all other cities, because it became the capital city

5. ... but was still very important and played a great role in Russian history

2.

1d, Дворцовая Площадь

2f, Большой Театр

3a, Зимний Дворец

4е, Летний Сад

5b, Невский Проспект

6с, Аничков Мост