1 Is he the politician that / which helped all those people? 2 My city, that / which has over four million inhabitants, is very polluted,
3 John's colleagues, who/ that he'd worked with for five years, gave him a big leaving party,
4 It was her personality that / who I disliked so much
5 Our heath service employs 1,7 million people, that / which makes it the biggest employer in the UK.