Combine the pair of sentences exercises by using the relative pronouns or relative adverbs

1. that is the lake. I went swimming in that lake.
2. she was dancing with the actor. He lived near my house.
3. the bed had no mattress. I slept on that bed
4. Romeo anh Juliet were lovers. their parents hated each other
5. the woman is a secretary. We are waiting for her.
6 the man was sitting at the desk. I had to come to see this man