Сделать ,. выберите нужную форму глагола, 1. by the beginning of the 21 st century a lot of models of planes (were invented/have been invented) 2 ln 1930 sliced bread (was introduced/has been introduced) in the usa 3 a photograph (was invented/has been invented) by thomas edison in 1877 4 many improvements (were made/have been made) in designing space rockets in russia by the beginning of the 21 st century 5 the first aeroplane in russia (was desighed/has been designed0 by mozhaiski in 1878.
2 was introduced
3 was invited
4 have been made
5 was designed