Bonjour, pouvez-vous m'aider

In which three of sentences 1-6 can the relative pronouns be left out? Cross them out.

1) The job that he got wasn't very interesting
2) A woman who(m) my sister knows has just bought the house next door.
3) The doctor who treated me didn't know what he was doing.
4) I'm sorry for people who haven't got a sense of humour
5) Have you got anything that will clean this carpet?
6) Have you got a typewriter that I can use​