Ответ:

Правило: слова заменяются, если их регистр не соответствует нейтральному или официальному контексту.

  1. Unfortunately, he ended his days in an institution for the criminally insane.
  2. Oh no! I think I've put my shoulder out again.
  3. Language study classes are from 0900 to 1215 with options in the afternoon.
  4. You are invited to a formal dinner to celebrate the 25th anniversary of the foundation of the club.
  5. It's no good trying to deceive me. I'm not going to buy any insurance.
  6. She turned out to be a great boss to work for despite what everybody said about her.
  7. It is, to say the very least, rather regrettable that the Managing Director has decided to resign at this crucial time.
  8. Overweight children run a higher risk of heart disease in later life.
  9. My grandmother never bought a TV. She was quite happy listening to her radio, as she used to call it.
  10. Can you write a quick shopping list for me? You know how forgetful I am.
  11. One feels it may not be wise at this moment to press for an increase in salary.
  12. ‘Hi, Karen. So this is your new boyfriend.’ ‘Yeah, we’ve been going out for about two months now.’
  13. ‘I’m a bit worried about Harry, doctor. He’s got some nasty cuts on his legs.’
  14. ‘I see Fred Gomm’s been arrested again.’ ‘Oh, what for this time?’ ‘The usual — theft.’