1) are taken2) is done3) When was the radio invented?4) will be translated5) is spoken6) be answered7) will be prepared8) are grown9) will be discussed10) had been written11) What is usually made of milk in your country?12) be seen13) is used14) were painted 15) is covered16) was stolen 17) be explained18) are sold19) were arrested/ have been arrested 20) was painted