Ответ:

  1. The first television programmes were shown at the beginning of the 20th century.
  2. Nowadays new television technologies are being developed.
  3. He says the new book is being published in Room 15 now.
  4. Look! A new school is being built in our street.
  5. A lot of programmes on TV are devoted to sport.
  6. This fact is known to everybody.
  7. Don’t worry! Your papers are being prepared.
  8. These exercises were done yesterday.
  9. When Nick entered the kitchen, dinner was being cooked.
  10. These books are being sold everywhere now.