Question

[Nguyễn Thanh Dương]

Use the correct form of the past simple passive or the present perfect passive

1. In the First World War, radios ................ (use) to communicate with soldiers

2. Since the 1960s, many radios signals................... (send) into outer space

3. So far, no answers .......................... (receive) from other planets

4. It's possible that the signals have arrived on other planets, but the messages .......................... (not understand)

Answer 1

[Emma]

Use the correct form of the past simple passive or the present perfect passive

1. In the First World War, radios ......used.......... (use) to communicate with soldiers

2. Since the 1960s, many radios signals...........have been sent........ (send) into outer space

3. So far, no answers ...........have been received​............... (receive) from other planets

4. It's possible that the signals have arrived on other planets, but the messages ..........have not understood.​.............. (not understand)

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