1 The children have been told about the party.
2 Students are expected not to talk during the examination.
3 This button mustn't be touched while the experiment is in progress.
4 The flowers should be kept in a warm sunny place.
5 This machine must be cleaned every time it is used.
6 The bill had to be paid before the hotel was left.
Our radio is listened to everywhere. Это страдательный залог
Ответ : (a) это было очень просто
2. longer
3. more dangerous
4. politer
5. farther
6. more expensive
7. older (elder)
8. younger
9. heavier