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 ), ) a shoemaker,` he admitted.

the united states of america consisting of fifty states and a federal district. the country is situated mostly in central north america, where its forty-eight contiguous states and washington, d.c., the capital district, lie between the pacific and atlantic oceans, bordered by canada to the north and mexico to the south. the state of alaska is in the northwest of the continent, with canada to the east and russia to the west across the bering strait. at 3.79 million square miles (9.83 million km2) and with over 314 million people, the united states is the third- or fourth-largest country by total area, and the third-largest by both land area and population. it is one of the world's most ethnically diverse and multicultural nations.

now,  barack obama is a president of u.s.a.