Ответ:

Grammar: Prepositions

Here are the sentences with the correct prepositions:

  1. Why don't you turn off the lights? It's time to go to bed.
  2. Clark Kent turns into Superman when he senses danger.
  3. Can you turn on the news, please? I want to hear the weather report at the end.
  4. I am going to turn in now. It's getting late.