Заполните тексты с правильной формой глаголов в скобках. Albert einstein was

Заполните тексты с правильной формой глаголов в скобках. Albert einstein was perhaps the best-known scientist of the twentieth centure. As well as his scientific work he also took an active interest in political and social problems.For example, in 1939 he wrote a letter to President Poosevelt encouragig the US to start building an atomic bomb.Later, when he found out about Hiroshima and Nagasaki, he changed his mind.If I___(know), I___(become) a shoemaker, he admitted.