Ответ:

  • 21. We ran out of milk, so can you buy some when you're at the supermarket?
  • 22. If a burglar breaks into your house, always hand over your valuables.
  • 23. Keep your mobile phones switched on at night.
  • 24. I ran into an old friend at the supermarket yesterday.
  • 25. I saw two policemen running after a robber.