Нужно выбрать which/that итд use which and that to refer to things or ideas. e.g. it’s the programme which/that stars katie holmes. use who and that to refer to people. e.g. she’s the actress who/that married tom cruise. use relative pronouns to link pieces of information about a person or thing. e.g. marie curie was a scientist. she discovered radium. = marie curie was the scientist who discovered radium. the information after the relative pronoun often defines the subject. e.g. a search engine is a programme that finds information. e.g. a newsreader is a person who presents news on the tv or radio.