СРОЧНО! ДАЮ 30 БАЛЛОВ

complete the sentence using the correct relative pronoun or relative adverb

e.g. Jane, whose favorite hobby is fencing, also loves swimming

He explained ... he did it.

A doctor is someone ... helps treat sick people.

This is the park ... people come to play chess.

2004 was the year ... we completed in the skateboarding tournament.

Oh! Is she the person ... house is for sale?