Объяснение:

1. Mikhailovsky Castle is in Saint Peterburg.

2.Vasilii Bazhenov designed it.

3. He stayed in the castle for 40 days.

4.There are collection of some of the most. famous portraits of Russian leaders.

5.Because the architect used different styles.

Ответ:

1) Mikhailovsky Castle in Saint Petersburg.

2) Vasilii Bazhenov designed it.

3) Tsar Paul stay in the castle 40 days.

4) The Russian Museum collection of some of the most famous portraits of Russian leaders in the rooms on the second floor.

5) Because the architects used different styles.