Треба переробити в пасивний стан. 1. the theory of relativity was developed by albert einstein. 2. the first step on the moon was taken by neil armstrong. 3. the first bicycle was built in 1839. 4. the radioactive elements radium and polonium were discovered by marie curie.

1. The theory of relativity was developed by Albert Einstein.
2. The first step on the Moon was taken by Neil Armstrong.
3. The first bicycle was built in 1839.
4. The radioactive elements radium and polonium were discovered by Marie Curie.
Все 4 предложения в страдательном залоге.