Заполните тексты с правильной формой глаголов в скобках. Albert einstein was perhaps the best-known scientist of the

Albert Einstein was perhaps the best-known scientist of the twentieth century. 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 Roosevelt encouraging the US to start building an atomic bomb.Later, when he found out about Hiroshima and Nagasaki, he changed his mind.`If I knew, I would become a shoemaker,` he admitted.