That, when, whom, which, where, who, whose, who.
1) They're the people... want to buy our house.
2) We had a lovely meal at the place ... Phil recommended
4) The picture... she has just finished is unique.
5) You are the partner ...I want to work with.
3) We don't know the person... donated this money.
6) I couldn't help the students... tests were a failure.
7) Sheila knows... it happened.
8) That is the swimming-pool.... I used to go swimming.​