1. She gave me her email address, which was the way we managed to contact her later.
2. I spent the money on a new car, what I always planned to do.
3. Her face was red, which we knew she was upset.
4. He left at six, when she arrived.
5. The actor forgot his words, when they brought the curtain down.
6. I had a holiday in Spain, where I learned to swim.