1) are taken
2) is done
3) When was the radio invented?
4) will be translated
5) is spoken
6) be answered
7) will be prepared
8) are grown
9) will be discussed
10) had been written
11) What is usually made of milk in your country?
12) be seen
13) is used
14) were painted
15) is covered
16) was stolen
17) be explained
18) are sold
19) were arrested/ have been arrested
20) was painted