The letter ( the bolshoi theatre ( this picture ( a well-know artist in 1890 moscow ( 1147 yuri gagarin ( space on the 12th of april, 1961

The letter was sent yesterday.
The Bolshoi Theatre was built in1776.
This picture was painted by a well-know artist in 1890.
Moscow was founded in 1147.
Yuri Gagarin was sent to space on the 12th of April, 1961.

Это все страдательный залог, т.е. was/were + глагол во II форме (т.к. здесь Past Simple везде).
1) was sent
2) was built
3) was painted
4) was founded
5) was sent