Question

Используйте правильную форму прошедшего простой пассивный или настоящего совершенного пассивного. The radio......(invent)at the beginning of the 20th century .In the First World War ,radios ....(use)to communicate with soldiers. Since the 1960s,many radio signals......(send)into outer spaces. So far,no answers....(receive)from other planets. It's possible that the signals have arrived on other planets,but the messages .......(not understand ).

Answer 1

The radio was invented at the beginning of the 20th century. In the first world war, radios were used to communicate with soldiers. Since the 1960s, many radio signals have been sent into outer space. So far, no answers have been received from other planets. It's possible that the signals have arrived on other planets, but the messages have not been understood.