1.the dog has been rescued.it fell down a hole

=> The dog which fell down a hole has been rescued.

2.the accident wasn't serious.Daniel saw it

 => The accident which Daniel saw wasn't serious.

3.the story was untrue.It upset everyone

=> The story which upset everyone was untrue.

4.The vase was extremely valuable.david broke it

=> The vase which David broke was extremely.

5.the jacket is really nice.Melanie wore it at the party

=> The jacket  which Melanie wore at the party is really nice.

6.that man is a film producer.he interviewed Natasha

=> that man who interviewed Natasha is a film producer.

7.that man is a billionaire.Claire knows him

=> that man whom Claire knows is a billionaire.

1=> The dog which fell down a hole has been rescued.

2=> The accident which Daniel saw wasn't serious.

3=> The story which upset everyone was untrue.

4=> The vase which David broke was extremely.

5=> The jacket  which Melanie wore at the party is really nice.

6=> that man who interviewed Natasha is a film producer.

7=> that man whom Claire knows is a billionaire.