Rewrite the sentences with a present or past particible clause instead of a relative clause.
1. People who live in blocks of flats often complain of loneliness.
2. Letter that are posted before 5 p. m. should arrive the next day.
3. The rain that is standing on platform 5 is for Manchester.
4. Firemen have rescued passenger who were trapped in the accident.
5. They live in a lovely house that overlooks the River Thames.
6. It took workmen days to clear up the litter that was dropped by the crowd.