Поставьте глагол в правильное время в пассивном залоге 1. the rule explained by the teacher at the lasy lesson ( to understand) by all of us

The rule explained by the teacher at the last lesson  was understood   by all of us.

The nevyansk icon museum in yekaterinburg   is a private museum of icons in russia. entrance is free for everyone. the museum was opened in 1999 by evgeny roizman. according to chief curator maksim borovik, in its first five years, more than 200,000 persons visited it. the main purpose of the museum is to save the phenomenon of the nevyansk icon. there isn't a great quantity of nevyansk icons, but each of them is a precious treasure. the nevyansk icon is documented as having existed from 1734 (the icon "our lady of egypt"), until 1919 ("the saviour pantocrator"). yekaterinburg is located in the middle of the eurasian continent, on the border of europe and asia. there are over thirty museums in yekaterinburg, including several museums of ural minerals and jewelry, art galleries, and the famous shigirskaya kladovaya, or shigir collection, which includes the oldest wood sculpture in the world: the shigir idol, found near nevyansk and estimated to have been made about 9,500 years ago. only here can you see a collection of nevyansk icons, in the nevyansk icon museum, with more than 300 icons representing the 18th through the 20th centuries on display.