Combine each pair of sentences into one by using a suitable Relative Pronouns

IV. Combine each pair of sentences into one by using a suitable Relative Pronouns.
1. Have you ever spoken to the people? They live next door.
.........................................................................................................
2. It's a book. It will interest children of all ages.
.........................................................................................................
3.The people keep having all night parties.They live next door.
.........................................................................................................
4. These are the keys. They open the front door and back door.
.........................................................................................................
5. Here's an article. It might interest you.
........................................................................................................