Ответ:
1. We were shown a very strange picture.
2. You are being looked for. Go home.
3. All of you will be gathered in the hall and told about all the changes in the school curriculum. 4. Why is he always laughed at?
5. All of us were given tickets to the exhibition. 6. The lectures of this famous professor are always listened to with great attention.
7. Am I being waited for?
8. They were asked three difficult questions. 9. The headmaster has already been sent for. Please wait a little.
10. Everybody was invited to a big hall.
11. These letters have been looked through. They can be sent.
12. At the station they were met by the guide and taken to the hotel.
13. These magazines must be returned to the library next week.
14. At our lessons much attention is paid to pronunciation.
15. Ivanov was told to explain why he missed classes.
16. Shall I be invited to your party?